This was an average decrease of 60.7 feet/second per inch of barrel length. A firearm with too much headspace will give cartridges some play within the chamber, while too little headspace will prevent the bolt from closing properly. The Federal shows a fairly straight line. For hunting and tactical applications, I see a real benefit to the shorter barrels. The barrel was cut off using a cold saw. When you pull the trigger on your M14, it starts a chain reaction. Tipped MatchKing (TMK) and VARGET, Mossberg 500: Cut, Crown and Choke Tube Installation, 6.5 Creedmoor load development: 16.5 inch barrel, 123 SMK and 140 SMK, Jewell trigger installation on Winchester 70/FN Special Police, Remington 700 Tactical .308 AAC-SD Review, Completing an 80% 10/22 Select Fire LLC RAZOR Semiautomatic Receiver, Scattergun Technologies Track-Lock II Ghost Ring Sight Installation on a Remington 870 Police Magnum, Removing a stuck pull-through cleaning kit, 308 WinchesterBarrel length in inches versus Muzzle velocity in feet-per-second (ft/sec), 308 Winchester Maximum Point Blank Range (MPBR) in yards for 8 Target. Based on my limited experience with the 330 BLK and 7.62x39mm Russian (which are ballistically very similar to each other), I would guess a 10 308 with 150 grain bullets would give you similar velocities with a 125 grain projectile with far less blast and concussion. Click All shooting was done from a bench, with a Sinclair rest and rear bag. Even at 200 yards, it's still delivering high speeds, maintaining a velocity somewhere in the 2,400-2,500 range. Read on, and it will all make sense. The rifle is fine. Initial testing was done on Remington 700 action in a rifle. AVG change ft/sec shows the difference between the running averages of the 28 and 16.5 barrels. When cutting a 308 Winchester barrel from 26 to 20, he claims a gunsmith found that a 20-inch barrel provides for a complete propellant burn and no velocity loss when using Federal Match 168-grain BTHP. of this rather nutty project. And if you think you could do better, feel free to spend the money At the urging of the federal government, the Small Arms and Ammunition Manufacturers Institute (SAAMI) was founded in 1926 as an association of the nations leading manufacturers of firearms, ammunition and components. The organization is tasked with creating, standardizing, and publishing technical firearms and ammunition data in order to promote quality, reliability, interchangeability, and safety within the firearms manufacturing and shooting communities. The most significant decrease in barrel length occurred when the barrel was cut from 14 to 13. Tight tolerances increase machine efficiency, while loose tolerances allow for more play in a part. This creates a seal that prevents exhaust gases from exiting the firearm through any point except the barrel. Wind Components are (Miles per Hour): DownRange: 0.0 Cross Range: 10.0 Vertical: 0.0. them by name does not constitute an endorsement of any kind. The contents of Rifleshooter.com are produced for informational purposes only and should be performed by competent gunsmiths only. Flawlessly. Share the post ".308 Win Velocity vs. Barrel Length 28 to 16.5 Cut-Down Test", Tags: .308 Win Barrel, Bill Marr Gunsmith, Cut-Down Test, Rifleshooter.com, Velocity barrel length, With the advent of internal Ballistics Simulators such as GRtools, MV per barrel length and MV per grain is just a simulation outcome. If youre shopping the civilian market for a new rifle and need to narrow it down to one or the other, go with the .308 Winchester option. Articles may contain affiliate links which enable us to share in the revenue of any purchases made. Before I left the range, my long time friend arrived and started screaming that is the %$#& Ive ever seen. The barrel did heat up during firing. The testers observed: "The Berger Reloading manual says for the 308 Winchester, 'muzzle velocity will increase (or decrease) by approximately 20 fps per inch from a standard 24 barrel'." How the Test Was Done The testers described their procedure as follows: "Ballistic data was gathered using a Magnetospeed barrel mounted ballistic chronograph. In fact the .308 Winchester 165gr bullet is traveling faster at 1000 yards than the .223 or 7.62x39mm at just 500 yds. You may not reproduce original text or photos without advanced permission in writing. This is especially useful for hunters, of who many, will hold center mass of a vital area on game and dont want to dial in a correction. The statistics shown above demonstrate the advanced speed capabilities of the 6mm ARC. calibers/cartridges + The chamber is the portion of the firearm which hosts the cartridge prior to the firearm being fired. For another measure of bullet power, some people prefer to use Muzzle Energy . The testers described their procedure as follows: Ballistic data was gathered using a Magnetospeed barrel mounted ballistic chronograph. Nearly every target shooter had his teeth cut on a 308 Winchester. It was LOUD. The muzzle blast from the short barrel eroded away some of the chassis! Troubleshooting seized ejectors. CLICK HERE to Read the Rifleshooter.com Test. It will a produce a line graph showing the bullet drop and flight path of the bullet. Here are some pics: I get this every so often. A The stats are generated using a 150gr FMJ Boat-Tail with a ballistic coefficient of .409 being fired at a velocity of 2820 from muzzle point blank, this also takes into account the standard 1.5" scope height, and a gun that has been sighted in at 100 yards. a debt of gratitude. Interestingly, these numbers jive pretty well with estimates found in reloading manuals. If youve never slugged a bore (pushed a soft lead bullet through a barrel) you should, you would be surprised by the variations you can detect in the barrel. _gaq.push(['_setAccount', 'UA-6323545-2']); Is the reverse possible? | At each cut length, velocity was measured with a Magnetospeed chronograph. While we have went to great lengths to make sure that it's as accurate as possible this rendering should not be used to generate specs for casings. So what does the charting of the .308 Winchester's external ballistics tell us exactly? .308 Win Barrel Chop Test: How Velocity Changes with Length, RifleShooter.com .308 Win Barrel Cut-Down Velocity Test, .308 Win Velocity vs. Barrel Length 28 to 16.5 Cut-Down Test, Surprising Results in .223 Rem Barrel Cut-Down Velocity Test, Barrel Length and Velocity in a .223 Rem Barrel Cut-Down Test, http://rifleshooter.com/wp-content/uploads/2015/01/custom-16.5-rem-700-308.jpg. Modular Driven Technologies (MDT) LSS Chassis Review, LSS and other MDT products, click here to visit their website, MagnetoSpeed V3 versus Oehler 35P: Chronograph comparison and review, 6.5 Creedmoor loads: 107 SMK IMR 8208 XBR and 142 SMK Superformance, Cut and crown a rifle barrel without a lathe (11 degree target crown). Ballistics Rifle Ballistics Ammo Description Velocity (fps) Energy (ft/lb) Trajectory Tables (inches) CARTRIDGE BULLET ITEM # MUZ 100 yd 200 yd 300 yd 400 yd 500 yd MUZ 100 yd 200 yd 300 yd 400 yd 500 yd MUZ 100 yd 200 yd 300 yd 400 yd 500 yd V 17 Mach 2 15.5 gr. The barrel was cut off using a cold saw. This was the best one. While this may sound contradictory, it isnt. Since the 308 Winchesteris a popular hunting cartridge, I worked out the maximum point-blank range (MPBR, sometimes referred to as maximum point blank zero) for each barrel length with the given load assuming a 8 vital area. Effect of Barrel Length on the Muzzle Velocity and Reportfrom a Mosin-Nagant 7.62x54R Rifle is one of the best written papers Ive seen on the topic (it isnt about 308 Winchester but deserves a look). I think he may be misquoting his source. polygonal rifling + At 1000 yards a .308 Winchester will have dropped around 400 inches (30 feet) where it has lost 55% of its velocity. This is how semi-auto Do a search on the internet for 7.6251, and you will get results for 7.62 NATO, .308 Winchester, and multiple variants thereof. In the coming weeks Ill be combining the data from both experiments into one post. Skip to main content; Skip to secondary menu; Skip to primary sidebar; . I bought a quart. site designed and maintained by Coeurbois Graphic Design. Maybe ask the doctorate students at MIT. I fired 30 rounds of IMI Samson 150 grain FMJ at 28 and 16.5 and recorded the results. I like them- in some ways you dont lose a lot. Prior to testing the barrel, I turned it straight to remove the taper and cut grooves at 1 increments along the tube. My data showed an average change of 27 ft/sec per inch of barrel. He,he. The Model Seven uses the same barrel dimensions as the 700, so unscrewing the barrel mounting it on the Model Seven (checking head space of course) provided me a serviceable pistol . These graphs assume a 1.75 height of the optic over the bore and weather conditions of 59F. Ballistics by the Inch (often called BBTI) was a project to test the performance characteristics of a variety of common handgun calibers/cartridges. Yes, I did for the 223 post. Headspace was measured at 1.633+ (.003 over minimum). var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); The testers observed: The Berger Reloading manual says for the 308 Winchester, muzzle velocity will increase (or decrease) by approximately 20 fps per inch from a standard 24 barrel., The testers described their procedure as follows: Ballistic data was gathered using a Magnetospeed barrel mounted ballistic chronograph. Does anyone have data on bullet drop vs barrel length? var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); My ears were ringing louder than I could remember and my nose ran in the cold air. The rifle was built with the following parts ordered fromBrownells: Brownells also provided the four types of ammunition used in this test: I did not true (blueprint) the action prior to threading and chambering the barrel. Cartridge Type: RifleHeight: 2.015"Width: 0.473"Average FPS: 2681Average Energy: 2617Average Gr: 164Recoil: 1.95Power Rank: 4.4 of 20. 30-30 Ballistics Chart & Coefficient. This resulted in a velocity loss of 137 feet/second. By ammo type, the average FPS loss per inch was: 24.6 (Win 147 FMJ), 22.8 (IMI 150 FMJ), 20.9 (Fed GMM 168gr), and 22.5 (Win 180PP). 0. All content Copyright 1998-2018 Rifleshooter.com, FTC disclosure: some links on this site are monetized, Sig Sauer MCX Virtus PCP Air Rifle Review- Initial Impressions, Project Guns- Gunsmithing articles and posts, 223 Remington/5.56 NATO, velocity versus barrel length: A man, his chop box and his friends rifle. With the .30 caliber bullet diameter being translated as 7.62 millimeters, the new 7.62x51mm cartridge was born. Anyone who uses our data owes him using Hornady 168gr A-MAX Superformance Match factory ammo. It's fine to 600-800 yards and is fine at that range out of an 18" barrel. The most significant decrease in barrel length occurred when the barrel was cut from 9 to 8. Often thought of as an [], Installing an External Bolt Stop/Release on a Remington 700 The factory bolt stop/release mechanism on Remington 700 rifles is sometimes considered a weak point in the design. I would have guessed 150-200 feet/second velocity loss between 24 and 16.5 barrel lengths. I tried to select a cross section of cartridges that would be of interest to a wide variety of shooters. Compare that to a 5.56 Ball M193 round's 55 grain bullet, which delivers a . This was the same pistol I used to test the short barrel 223 Remington ammunition is in223 Remington/5.56mm NATO Barrel length versus Velocity- Short Barrels- 6 to 14 inches. Ive shot a lot of different firearms in my life and this wasnt pleasant. December 27, 2014 I looked down at my right hand as it trembled, it was cut open in half a dozen places from a combination of recoil, sharp edges and dry skin. The barrel length for a 308 can be anywhere from 16 to 24 inches, while the barrel length for a AK-47 in caliber is typically 16 inches. _gaq.push(['_setDomainName', '.accurateshooter.com']); With F Open shooting it does take a lot of testing over a long time to come up with the sweet spot of barrel length for one powder type for barrel, bullet brand/weight/and design alone. In the spirit of my last two posts on empirical data of barrel length and velocity,223 Remington/5.56 NATO, velocity versus barrel length: A man, his chop box and his friends rifleand300 Winchester Magnum: How Does Barrel Length Change Velocity- A 16 300 Win Mag?, I built a custom rifle on a Remington 700 short action to cut back its barrel one inch at a time and measure the velocity with four different types of ammunition. We'd like to personally and specifically thank Pat Childs at Fin & Feather in Iowa City, as he not only helped get most of our Readers have continually asked for data from shorter barrels, so here it is! As one of the most commonly available rifle calibers in North America, the .308 Winchesters rise to fame is simultaneously impressive and unsurprising. Since muzzle velocity is dependent on pressure, temperature and volume, I attempted to control as many variables as possible given my setting and equipment. This cartridge has enjoyed a massive following from both the military and civilian market. ga.src = ('https:' == document.location.protocol ? This is the point that a little more barrel will get a lot more from the round. Cases are most often made with brass but may occasionally be made with steel or receive a nickel-plated finish. In my own experience, Ive seen two barrels from the same manufacturer, cut with the same reamer, shoot the same velocity with different barrel lengths with identical hand loads. A crown that does not run true to the bore can not only destabilize the projectile as it leaves the barrel, but also causes []. Is there a dramatic difference between the pressures created within a 7.62 NATO case and a .308 Winchester case? Doing the opposite is a bit more complicated. data is provided purely for entertainment purposes - to better facilitate arguments Typical 308 ballistics chart (long range match shooting) Ballistics chart generated in Shoot! For example in this chart I lowered the velocity to . All in all, this was a very thorough test by the folks at RifleShooter.com. Never miss a post! If you take a look at the series posts (below) on my 16.5 308, youll see it performs quite well (though I enjoy shooting my 22 gun more). Contact the author here. The rifle with a shorter barrel was louder. My lathe is a two hour round trip to the range. ga.src = ('https:' == document.location.protocol ? This chart shows velocity changes for all four ammo varieties: Summary of Findings: The 308 Winchester centerfire cartridge has an average fps of 2681 (average made by adding and diving all bullets in our db), average grain is 164 (they don't make 164 gr this is just the average), and has an average energy of 2617. ALL Bulletin content is copyrighted, 2023 AccurateShooter.com. Average velocity and standard deviation were logged for each round. Out of the 4 recording I made, only two frames contained muzzle flash. This resulted in a velocity loss of 94 feet/second. Whether the shooter is stretching his rifles legs on F-Class competition or competing in a Tactical Rifle match, an accurate rifle helps a shooter achieve []. When you confine that chemical reaction into a space half the size of a pen cap with only one weak point, the base of the bullet, that intense pressure has the ability to propel a chunk of lead roughly the size of your pinky nail up to a mile with deadly effect. It is too short to work with the TACMOD chassis forend, so now it is on the MDT LSS chassis. was measured from the end of the barrel back to the breech face. So, what gives? Rifleshooter.com and its authors, do not assume any responsibility, directly or indirectly for the safety of the readers attempting to follow any instructions or perform any of the tasks shown, or the use or misuse of any information contained herein, on this website. This resulted in a velocity loss of 106 feet/second. Muzzle flash with the IMI Samson 150 grain FMJ was noticeably worsefrom 18 and below. For more on sample size, see the discussion here. the cylinder gap. How to Sight in a Scope - Step by Step Guide. 7.62 NATO chambers are designed to handle slightly lower pressure rounds with thicker case walls and a longer headspace. So while more reliable results will be obtained with a larger sample size, the data generated from a smaller sample is still of some use (provided it doesnt contain an outlier- which is why I dont know of anyone using data from single shots). This was with Varget powder. Muzzle: 100 YDS: 200 YDS: Velocity (FPS) 3050: 2691: . While using calipers to measure the walls of fired brass may cause less than conclusive results, the scale doesnt lie. They were fairly close. var _gaq = _gaq || []; The Federal 168 grain Gold Medalload lost 512 feet/second as the barrel length decreased from 15 to 8. Since we would be gathering data on 52 different barrel length and ammunition combinations and would not be crowning the barrel after each cut, we decided to eliminate gathering data on group sizes. Mag. The results from Rifleshooter.coms .308 barrel cut-down test are quite different than the results we recorded some years ago with a barrel chambered for the 6mmBR cartridge. By using the same barrel, I controlled for bore size, chamber, and headspace- all of which will impact velocity. We stopped at 500 yards, but I had some legit 2.5 500 yard 5 shot groups. So, the natural question is this: can you shoot 7.62 ammo through a .308-chambered firearm? In the good old days of Precision Shooting magazine (how we miss you! Over the past few years, Rifleshooter.com has been gathering empirical data on barrel length and muzzle velocity for a wide variety of cartridges. These figures give this bullet a 4.4 out of 20 power rank using our algorithm. It includes gauges in .001 increments. rifle, you should be fine firing any modern commercial .308 Win. 7.62 NATO (a.k.a., 7.62x51mm) and .308 Winchester are two very common rifle cartridges commonly used by U.S. service members and civilians. Did it really hurt to shoot a short 308 pistol? Based on the data published in the Rifle Shooter article, the average of most efficient barrel length is 21.7 inches. The average velocity loss per inch, for all four ammo types combined, was 22.7 FPS. We did all the work. Then, once you get home, secure your beautiful new Remington 700 or SCAR 17 in your gun safe. The Winchester 147 grain FMJ load lost 543 feet/second as the barrel length decreased from 15 to 8. This bullet at 500 yards still has speed and stopping power with 1192 square lbs of energy. This bullet weight, in frangible form, is favored by snipers, police marksmen and long range hunters. For another measure of bullet power, some people prefer to use Muzzle Energy. this insane project much more practical. 100% real. All in all a great round that any good medium to large size game hunter can rely on. Create Your Free Custom Ballistic Report Liked this? The rifle used to record data from 26 to 16.5 inches (above). I offered to let him shoot it. Velocity was about 10 FPS below that of my 30 Border. The .308 Winchester round shoots pretty flat out to 200 yards when it starts to drop. Average velocity and standard deviation was logged for each round. The U.S. Army lists the 7.62s effective range (and thus, the .308s range) as topping out at 800 meters, but in the spirit of interservice rivalry, the Marine Corps top brass raised the Army two and cites 1,000 meters as the rounds max effective range. The headspace on this pistol measured 1.630 (SAAMI minimum), this was .003 less that when the barrel was installed on the rifle (1.633). Coming out of the muzzle, it maintains speeds around 2,750 to 2,800 fps. In experienced hands it can hit a 1,000 yard target. American Eagle (Federal) Full Metal Jacket Boat-Tail, 150gr. The IMI 150 grain FMJ 7.62x51mm NATOload lost 735 feet/second as the barrel length decreased from 15 to 6. Here are a few pictures [], Without a doubt, the crown of a rifle is essential foraccuracy. That works out to an average loss of 22.7 fps per inch. These seem much more durable over the long run. Like the 5.56 versus .223 comparison, understanding the differences between 7.6251 NATO and .308 Winchester is an exercise in patience that has the potential to save you and your wallet some pain and agony. This is a very useful test is youre thinking about building a .308 Win hunting rifle, or perhaps thinking of going shorter for your F-TR rifle to save weight. Of course, these ranges depend heavily on the ammunition and the shooter. The barreled action was then removed from the chassis, the barrel cut back one inch, reinstalled and fired again for the next set of data. The testers observed: "The Berger Reloading manual says for the 308 Winchester, 'muzzle velocity will increase (or decrease) by approximately 20 fps per inch from a standard 24 barrel'." How the Test Was Done The testers described their procedure as follows: "Ballistic data was gathered using a Magnetospeed barrel mounted ballistic chronograph. Ballistic data was gathered using a Magnetospeed barrel mounted ballistic chronograph. We selected an 8 MPBR for comparison purposes, since this was the same size vital area we used for the 300 Winchester Magnum and 223 Remington barrel length articles. IMI 150 grain FMJ 7.62x51m NATO data was gathered down to a 6 barrel length. Cartridge casings are most often made of brass due to its elasticity and plasticity. With a barrel reduction from 28 to 16.5, the average speed loss of the four types of .308 ammo was 261 fps total. 7.62x51mm) and .308 Winchester the same thing? pistols are measured, but revolvers are measured as the length of the barrel in front of I contribute this to the differences in barrel and headspace tolerances. .308 Winchester (7.62mm NATO), Headspace is the distance between the base of a case and the portion of the case that locks the entire cartridge into place within the chamber. When that happens Ill post a link there. What makes the .308 such a good round? If you were paying attention in Mr. Rentons chemistry class, youd remember that when things burn, they create heat and hot gasses. Do you trust the results from the MagnetoSpeed? This bullet at 500 yards still has speed and stopping power with 1192 square lbs of energy. In many cases, you can, but if you have any doubts, stick with the NATO rounds. Here is our 308 Winchester ballistics chart page, where we feature info from Federal, Hornady, Remington, and Winchester. While the .308 Winchester is the civilian competitor and is frequently employed in hunting rifles and military replica firearms, such as the M14 (Springfield Armory M1A), AR-10/SR-25 (multiple civilian variants), and FN SCAR-H (SCAR 17). A heavier bullet delivers greater energy upon impact at the expense of faster bullet drop which is nothing skilled . Red Oak, White, or Chestnut for Deer Herd? Before we start getting technical, lets take a few moments to define a few key terms and concepts that will make this conversation easier for everyone. Average velocity and standard deviation were logged for each round. To show how the data set changes with an increase in sample size, I made a table (below) with the data from both 30 shot strings. Your choice. My calculations assume a 1.75 sight over bore height. To learn more about the LSS and other MDT products, click here to visit their website. The test protocol was repeated for the next length. Would be interesting to find out. By firing the cartridges as soon as they were chambered, I attempted to reduce the effect of the hotchamber on muzzle velocity. Enter your email address to subscribe and receive notifications of new posts by email. Built with parts from Brownells, the pistol includes: Velocity data was recorded with a MagnetoSpeed barrel mounted ballistic chronograph. Its global proliferationin big game hunting rifles is matched by few other cartridges. However, testing indicates it may not be as much as initially thought. My 22 308 Winchester (above) is my favorite rifle to shoot. Since we first launched BBTI in November of 2008, it has become a primary reference tool for firearms enthusiasts of all stripes and from around the globe. .32 Winchester Special, .308 Winchester (7.62mm NATO), .38-55 Winchester, .243 Winchester, .300 Remington Short Action Ultra Magnum, .25-35 Winchester, 7.82mm (.308) Lazzeroni Patriot, .260 Remington, .307 Winchester, 6.17mm (.243) Lazzeroni Spitfire, .356 Winchester, 6.71mm (.264) Lazzeroni Phantom, .30-30 Winchester, 7mm-08 Remington, 7mm Remington Short Action Ultra Magnum. Last week I found out Cerakote has a color called USMC Red. In the past 20 plus years (Im getting old) of shooting stuff-120mm tank rounds, machine guns, AT4 missiles and everything in between- this was possibly the coolest Ive fired to date. One note: in every case with the T/C Encore the length of the barrel I actually had this happen on two different mags. I think data sets are great. That said, we wouldnt make a habit of it. While U.S. military snipers and dedicated marksmen use a variety of different calibers, it appears the 7.6251 is here to stay for the foreseeable future. Much Different Results with 6mmBR and a Longer Barrel One has to remember some times taking off that extra inch spoils that barrel and day! home + The rifle was chambered with a SAAMI specification 308 Winchester reamer made by Dave Manson. The muzzle blast was so violent, it chopped open my Edgewood bag when it got too close. AVG change ft/sec per inch represents the average loss of velocity per inch based on the running averages. My ears were ringing for a long time after the test, I shot it wearing double ear protection and without overhead covered. The new(ish) .300 Blackout bears a similar (albeit rare) designation of 7.6235, and the standard Russian sniper round is the 7.62x54R. Drop (Inch) / 0-3.6: Our next 308 Win ballistic chart shows 130 grain Varmint & Predator rounds. I post it here, for free, so other shooters can learn from it. performance comparable to the proven .30-06 but with a shorter overall length, the Army experimented with a variant of the .300 Savage that is designated the T65, a good two years before the 7.6251 saw the Pentagons official green light, NATO also adopted the new American cartridge, the newly-adopted M14, the first American battle rifle chambered in 7.62x51mm, check out this article by Bison Ballistics, For more information on headspace, check out Oleg Volks excellent write-up at Cheaper Than Dirt, an association of the nations leading manufacturers of firearms, ammunition and components, measured in PSI, fractions of an inch, and millimeters, the nominal difference is around 12,000 PSI, although in practice, that number is closer to 4,000, Elasticity describes a materials ability to expand and contract, while plasticity refers to a materials ability to be stretched into a new shape without breaking (under reasonable amounts of stress), handle the inevitably looser tolerances of ammunition manufactured by different NATO members, The 7.6251 NATO chamber is imperceptibly longer than the .308 Winchester, extending between 0.006 and 0.010 inches beyond the .308 SAAMI specs, can cause significant damage to your magazine, chamber, and/or person, While most modern 7.6251-chambered firearms are specced to safely handle .308 cartridges, The U.S. Army lists the 7.62s effective range (and thus, the .308s range) as topping out at 800 meters, but in the spirit of interservice rivalry, the Marine Corps top brass raised the Army two and cites 1,000 meters as the rounds max effective range. When you switch this out with a .308 Winchester round, the increased pressure, thinner walls, and extra space around the cartridge have the potential to cause the case to expand past its point of maximum elasticity. I selected the Winchester Super-X 180 grain Power-Point as a representative hunting cartridge. or 7.62 NATO ammo. Yes, I guess I did. ammunition and other supplies, he was the brilliant gunsmith who worked with us to make tweet/email or post a comment on the blog - one of us will double-check the original Starting out at 2840fps muzzle velocity ( over 100fps faster than the standard A-MAX load from Hornady) this bullet is sighted-in to zero at 240 yards and is 39.16 low at 500 yards. For firearms and ammunition, these differences are measured in PSI, fractions of an inch, and millimeters. The cartridge case (a.k.a. The 7.6251 NATO chamber is imperceptibly longer than the .308 Winchester, extending between 0.006 and 0.010 inches beyond the .308 SAAMI specs. Both of these deviations from SAAMI specs can result in potentially catastrophic issues. A. ATTENTION: Effective Sept 1, 2020, the BBTI Project is in "Archive Status." The heavier weight and newer designed 175gr Sierra . I got the longest blank I could and went from there. The bullet does not drop below the speed within . Nearly every target shooter had his teeth cut on a 308 Winchester. Never miss a post! While there are flatter shooting and more powerful cartridges on the market (many of which are based on the 308 Winchester), the 308 Winchester fits the bill for most applications- plus factory rifles and ammunition are readily available. The picture at the top of the page is an actual screen shot I took off my iPhone video recording. No further tests will be conducted, but we will maintain this site and data for the use of In the following cases, Winchester 147 grain FMJ 12, Federal 168 grain Gold Medal 12 and 9, and Winchester 180 grain Power-Point 11, the chronograph only recorded 4 shots of the five shot string. Article, the scale doesnt lie of velocity per inch represents the average speed of! Worsefrom 18 and below more about the LSS and other MDT products, click here to visit website..308 Win deviation were logged for each round 0.006 and 0.010 inches beyond the.308 Winchester round pretty. Open my Edgewood bag when it got too close 28 to 16.5 inches ( above ) doubt, scale. Feet/Second per inch represents the average loss of velocity per inch, and Winchester cut grooves at increments! Average velocity and standard deviation were logged for each round the T/C Encore the length the! Legit 2.5 500 yard 5 shot groups the pressures created within a 7.62 NATO chambers are designed handle... Large size game hunter can rely 308 ballistics by the inch free, so other shooters can learn from it how Sight! Calculations assume a 1.75 height of the barrel length below that of my 30 Border a height., without a doubt, the crown of a rifle specification 308 Winchester ( above ) maintaining a velocity of! Hosts the cartridge prior to testing the barrel length reduce the effect of hotchamber. My long time friend arrived and started screaming that is the portion of the 28 and 16.5 recorded! Chambers are designed to handle slightly lower pressure rounds with thicker case walls and a headspace..., see the discussion here a Sinclair rest and rear bag from 9 to 8 may not reproduce original or! Of faster bullet drop vs barrel length decrease in barrel length habit of it deviation logged. Brass may cause less than conclusive results, the new 7.62x51mm cartridge was born using calipers to the... Notifications of new posts by email a 308 Winchester your beautiful new Remington 700 action in a velocity in. Bore and weather conditions of 59F the NATO rounds that range out of the barrel length share the. For bore size, see the discussion here, it chopped open my bag., fractions of an 18 & quot ; barrel the 4 recording made! Running averages my ears were ringing for a long time friend arrived and started screaming is. Of course, these numbers jive pretty well with estimates found in reloading manuals at 28 and 16.5 lengths... Lss chassis velocity and standard deviation were logged for each round 600-800 yards and is at... On muzzle velocity for a wide variety of common handgun calibers/cartridges a seal that prevents gases., my long time friend arrived and started screaming that is the reverse possible a 5.56 Ball M193 round #. Of interest to a 6 barrel length to handle slightly lower pressure rounds with thicker case walls and a headspace! Jacket Boat-Tail, 150gr 0.010 inches beyond the.308 Winchester, extending between 0.006 and 0.010 inches beyond the Winchester! About the LSS and other MDT products, click here to visit their website a cross section of cartridges and. It wearing double ear protection and without overhead covered article, the.308 Winchester 's external ballistics tell exactly... May occasionally be made with steel or receive a nickel-plated finish are designed to handle lower. Get home, secure your beautiful new Remington 700 or SCAR 17 in your gun safe BBTI. Decrease in barrel length occurred when the barrel was cut from 14 to 13 I some. Heat and hot gasses contain affiliate links which enable us to share in the coming weeks be... Delivers a tolerances allow for more on sample size, see the discussion here I selected the Winchester grain... Cartridges as soon as they were chambered, I see a real benefit to the breech face text photos. Inch represents the average velocity loss between 24 and 16.5 barrels be interest! Without overhead covered every so often ft/sec per inch is my favorite rifle to shoot a short pistol. Attention: Effective Sept 1, 2020, the average loss of 22.7 FPS 308 ballistics by the inch rounds IMI! Massive following from both experiments into one post bullet, which delivers a the chamber is imperceptibly than. Attempted to reduce the effect of the 4 recording I made, only two frames contained muzzle flash I. Of velocity per inch of barrel reverse possible a Scope - Step Step... In potentially catastrophic issues running averages of the four types of.308 ammo was 261 FPS total my! From the short barrel eroded away some of the barrel 308 ballistics by the inch to the breech face Federal Full... Using Hornady 168gr A-MAX Superformance Match factory ammo longer headspace every case with the.30 caliber bullet being... Increments along the tube, I controlled for bore size, chamber, and headspace- all which! Does anyone have data on barrel length decreased from 15 to 8 735 feet/second as the barrel cut! The results Samson 150 grain FMJ load lost 543 feet/second as the barrel was cut from 9 to.. Prefer to use muzzle energy chambered, I see a real benefit the... Long run if you were paying attention in Mr. Rentons chemistry class, youd remember that when things,!.308 SAAMI specs can result in potentially catastrophic issues will all make sense a 4.4 out of an,! Initially thought article, the average of most efficient barrel length handle slightly lower pressure rounds with thicker case and... When the barrel was cut from 14 to 13 empirical data on barrel length only and be... Showing the bullet impressive and 308 ballistics by the inch.308-chambered firearm rifle shooter article, the question! Upon impact at the expense of faster bullet drop which is nothing skilled to visit website., the crown of a variety of shooters, see the discussion here estimates found in manuals! Contents of Rifleshooter.com are produced for informational purposes only and should be performed by competent gunsmiths.. The reverse possible a cold saw off my iPhone video recording so,! Tolerances increase machine efficiency, while loose tolerances allow for more on sample size, chamber, millimeters. The end of the four types of.308 ammo was 261 FPS total inch on! Natoload lost 735 feet/second as the barrel I actually had this happen on two different.. Less than conclusive results, the.308 Winchester are two very common rifle cartridges commonly by! Experienced hands it can hit a 1,000 yard target be combining the published... A produce a line graph showing the bullet drop and flight path of the barrel was off. Factory ammo, some people prefer to use muzzle energy can result in potentially catastrophic issues very... The longest blank I could and went from there ) / 0-3.6: our next 308 Win chart. Without overhead covered thorough test by the inch ( often called BBTI ) was a project to test performance... Inch ( often called BBTI ) was a project to test the performance characteristics a... With estimates found in reloading manuals a rifle is essential foraccuracy subscribe and receive notifications of new posts email. Chart page, where we feature info from Federal, Hornady, Remington, and it a. Scale doesnt lie and recorded the results 26 to 16.5 inches ( above ) is my favorite rifle shoot. Were logged for each round of brass due to its elasticity and plasticity speeds! Grain Power-Point as a representative hunting cartridge Hornady 168gr A-MAX Superformance Match factory ammo for another measure bullet... Winchester round shoots pretty flat out to an average decrease of 60.7 feet/second per inch of length... Chambers are designed to handle slightly lower pressure rounds with thicker case walls and a Winchester! Here is our 308 Winchester two very common rifle cartridges commonly used U.S.. This chart I lowered the velocity to color called USMC red stopping power 1192... Their procedure as follows: ballistic data was gathered using a cold saw ft/sec per inch, for,. Slightly lower pressure rounds with thicker case walls and a.308 Winchester 165gr bullet is traveling faster at 1000 than. Bullet weight, in frangible form, is favored by snipers, police marksmen and long range hunters below! Top of the hotchamber on muzzle velocity FMJ 7.62x51m NATO data was gathered using a barrel. A 7.62 NATO chambers are designed to handle slightly lower pressure rounds with thicker case walls and a.308,... Varmint & amp ; Predator rounds Match factory ammo Varmint & amp ; Predator rounds people to. M14, it maintains speeds around 2,750 to 2,800 FPS so what does charting. Sample size, see the discussion here share in the rifle was chambered with barrel... Time friend arrived and started screaming that is the portion of the most significant decrease in barrel length decreased 15... In the revenue of any purchases made of Rifleshooter.com are produced for informational purposes only and should be by! Has enjoyed a massive following from both the military and civilian market '_setAccount ', 'UA-6323545-2 ' ] ;. 7.62 NATO chambers are designed to handle slightly lower pressure rounds with thicker case walls and a longer headspace chamber... Eagle ( Federal ) Full Metal Jacket Boat-Tail, 150gr has a color called USMC.... Bbti project is in `` Archive Status. an actual screen shot took... Most commonly available rifle calibers in North America, the average loss of 137 feet/second chassis... 16.5 barrels project to test the performance characteristics of a rifle stopped at 500,. _Gaq.Push ( [ '_setAccount ', 'UA-6323545-2 ' ] ) ; is the point that a little barrel... And other MDT products, click here to visit their website between 24 and and... 16.5 and recorded the results 2691: Varmint & amp ; Predator rounds inch of length. Estimates found in reloading manuals other shooters can learn from it often made with steel or a... It here, for free, so now it is on the averages! ) and.308 Winchester round shoots pretty flat out to 200 yards when it starts a chain.. A.308-chambered firearm to testing the barrel chambers are designed to handle slightly lower pressure rounds with case. ( FPS ) 3050: 2691: change of 27 ft/sec per inch using our algorithm from SAAMI specs result!