That is actually not correct. Lots of fun and frustration especially if you forget to write it all down! NOTE: Many shooting newbies may see the number combination 7.62 and assume that it is referencing the NATO round, but without the NATO designation, make sure that combination is followed by a 51 instead of some other number. Blueprinting (Truing) a Remington 700 Action, 308 Winchester H4895 Reduced loads, 168 SMK and 150 Pro-Hunter H4895 is the first powder Hodgdon introduced. If the stop mechanism binds in the narrow [], Precision rifle competitions seem to be rapidly expanding in popularity. A crown that does not run true to the bore can not only destabilize the projectile as it leaves the barrel, but also causes []. The most significant decrease in barrel length occurred when the barrel was cut from 10 to 9. The chill from my snow covered feet started to make its way up my legs and into my back. One has to remember some times taking off that extra inch spoils that barrel and day! Need help keeping it straight? 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). To make the test even more interesting, four different types of .308 Win factory ammunition were chronographed at each barrel length. The barrel did heat up during firing. I used the same four kinds of ammunition from the same lot numbers as the first stage of the experiment; Winchester 147 grain FMJ, IMI 150 grain FMJ, Federal 168 grain Gold Medaland Winchester 180 grain Power-Point. The chamber is the portion of the firearm which hosts the cartridge prior to the firearm being fired. 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. Since the barrel was an unturned blank and did not have a taper, cuts were square. Is the reverse possible? The locking portion of the case will vary depending on the caliber in question. I woke up early that morning. 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). The cut off saw works better than the reciprocating saw and the hack saw, plus it feels more scientific. them by name does not constitute an endorsement of any kind. What makes the .308 such a good round? Fear not. Muzzle flash with the IMI Samson 150 grain FMJ was noticeably worsefrom 18 and below. DPX: Federal 240 gr. Barrel length, Barrel length and velocity, External Ballistic Data, Rifles Winchesters fiber wrapped Win-Lite shotgun barrels, Custom 1911 Project: Part 3- fit and blend grip safety, Remington Model Seven (Model 7) Versus The Model 700, 6.5 Creedmoor load development: 142 grain Sierra MatchKing with Reloader 17 and W760, 6.5 Grendel loads in a Howa MINIACTION (6.5 Grendel load development), Rifleshooter.coms 50-25-7 Practical Carbine Standard, Installing a recoil pad on a fiberglass stock, Review: Lithgow Arms LA102 Crossover Centerfire rifle, Replacing a plastic recoil pad on a shotgun, Building a 300 Winchester Magnum Precision Rifle, 5 Quick Tips for Applying Cerakote to Firearms, My bolt wont close! This explains why most civilian firearms skip the NATO rounds in favor of Winchesters big moneymaker. Over the past few years, Rifleshooter.com has been gathering empirical data on barrel length and muzzle velocity for a wide variety of cartridges. 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. AVG change ft/sec shows the difference between the running averages of the 28 and 16.5 barrels. Remington Model Seven Actions are available! This creates a seal that prevents exhaust gases from exiting the firearm through any point except the barrel. All these details have been generated using our . Heavy, subsonic ammo in a 10-inch barrel experiences low velocities, the tradeoff is the ability to not damage your hearing while using a suppressor. The following is a 1000 yard .308 ballistic chart that was created using our free online ballistic calculator and details all aspects of the bullets trajectory from the millisecond it leaves the barrel until the time it reaches the 1,000 yd mark. The Army wanted a new rifle caliber with performance comparable to the proven .30-06 but with a shorter overall length, a new wonder cartridge. Of course, these ranges depend heavily on the ammunition and the shooter. Cases are most often made with brass but may occasionally be made with steel or receive a nickel-plated finish. Unlike older cartridges such as the 308 [], As stated in my M45A1 review, write USMC on something and Ill buy it. The .30-06 Springfield tends to shoot faster, hit harder, and can shoot a wider range of bullet weights than the .308 Winchester. Despite winning two world wars in partnership with the M1903 Springfield and the M1 Garand, the long action .30-06 Springfield fell out of favor with the U.S. Army following World War II. .357 SIG, .38 Super Auto Colt, .35 Whelen, .300 Remington Ultra Magnum, .35 Remington, .44 Smith & Wesson Special, .380 Auto (9mm Browning Short), 10mm Auto, .25 Winchester Super Short Magnum (WSSM), .303 British, 6.5x54 MS (6.5 Mannlicher-Schoenauer), .300 Remington Short Action Ultra Magnum, .218 Bee, 6.8mm Remington SPC, .25-20 Winchester. A 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. Released by Winchester in 1952 (and adopted by NATO in 1954 as the 7.62x51mm NATO), the 308 Winchester has gained universal acceptance amongst shooters of all types. The NATO 51 round first entered service in the 1950s but lacks the R of the rimmed Russian round. Red Oak, White, or Chestnut for Deer Herd? The 6.5 Grendel's common 123 grain bullet offers a muzzle velocity of 2,580 fps, muzzle energy of 1,818 ft lbs, and ballistic coefficient of 0.506. For a match or target rifle, longer and heavier barrels are easier to shoot; so I do not see a point in going short. Headspace was measured at 1.633+ (.003 over minimum). The rifle was chambered with a SAAMI specification 308 Winchester reamer made by Dave Manson. This resulted in a velocity loss of 94 feet/second. It was only a few days after a historic blizzard passed through my state. 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. 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. I like it a lot. Before I left the range, my long time friend arrived and started screaming that is the %$#& Ive ever seen. I did not control for barrel temperature. Velocity loss can be more extreme with shorter barrel lengths (and bigger cartridges). Yes, I guess I did. They were fairly close. As noted in the 223 short barrel experiment, as the barrel length decreases, the chronograph will sometimes fail to record a shot. Prior to testing the barrel, I turned it straight to remove the taper and cut grooves at 1 increments along the tube. The latter has nearly twice the propellant, and is therefore better able to fell very distant game. With a barrel reduction from 28 to 16.5, the average speed loss of the four types of .308 ammo was 261 fps total. Super Short Precision Rifles: Is there such thing as a 16.5 .308 Tactical Bolt Action Rifle? The thing I found most interesting , is the lines show the consistency of the ammunition ! A. Temperature was 47 F.. 308 Winchester/ 7.62x51mm NATO Short barrel length and velocity- A six inch 308 bolt gun? My lathe is a two hour round trip to the range. ga.src = ('https:' == document.location.protocol ? Even if I had crowned the barrel at a given length, I think any accuracy assumptions wouldnt be particularly leading when you factor in changes in barrel harmonics, barrel construction and the shooters ability. Ive been beating on the 510 and 517 for a while. mostly) paid for everything ourselves, and we did not receive any kind of sponsorship I bought a quart. 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. 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 []. Yes, I did for the 223 post. So, the natural question is this: can you shoot 7.62 ammo through a .308-chambered firearm? data for your own use. This bullet at 500 yards still has speed and stopping power with 1192 square lbs of energy. By Is there a dramatic difference between the pressures created within a 7.62 NATO case and a .308 Winchester case? This was noticeable from 19 inches and below. 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. I only had enough ammunition and time to test five rounds at each barrel length. Short Rifle, Long Range: Testing our 16.5 308 Remington 700 out to 635 yards, 16.5 Inch 308 Winchester Precision Rifle: Summary of a Short Rifle. var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; Do a search for .308 and you will find similar results, albeit with fewer references to 7.62. With barrels, one wonders Can a little more length provide a meaningful velocity gain? To answer that question, Rifleshooter.com performed an interesting test, cutting a .308 Win barrel from 28 all the way down to 16.5. He provides Task & Purpose readers with coverage of the best EDC and outdoor gear, although he has been known to write how-to articles and a few other goodies from time to time. Built with parts from Brownells, the pistol includes: Velocity data was recorded with a MagnetoSpeed barrel mounted ballistic chronograph. My data showed an average change of 27 ft/sec per inch of barrel. (function() { this insane project much more practical. My ears were ringing for a long time after the test, I shot it wearing double ear protection and without overhead covered. Mag. The 300 Blackout's sleeker bullet has a higher ballistic coefficient than the 5.5645, but with less speed its trajectory invariably arcs more sharply. So in quick summary the .308 Winchester also known by it's military name the 7.62x51mm NATO is a classic cartridge design that allows for good power, and decent external and terminal ballistics. With tunning accuracy is 99.7%. First, lets talk about pressure. Bill Marr Much Different Results with 6mmBR and a Longer Barrel Using one of the many bullet drop calculators available on various ammunition manufacturer websites, we can measure different bullets and distances easily. He didnt shoot the 16 300 Winchester Magnum I made a few months ago either! The rifle is fired at 100 yards, from a bipod with a rear bag, for 5-rounds. 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. The 30-30 Winchester 150 gr. Rifleshooter.com also offers ballistics graphs showing trajectories with different barrel lengths. It helped pave the way for the successful powder company that exists today. Hydra-Shok JHP: Speer 200 gr. Velocity was about 10 FPS below that of my 30 Border. 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). Maybe ask the doctorate students at MIT. 22" is optimum for the 308,Longer will get more velocity, but at a price. No, I did not. Cartridge Type: RifleHeight: 2.015"Width: 0.473"Average FPS: 2681Average Energy: 2617Average Gr: 164Recoil: 1.95Power Rank: 4.4 of 20. The statistics shown above demonstrate the advanced speed capabilities of the 6mm ARC. By firing the cartridges as soon as they were chambered, I attempted to reduce the effect of the hotchamber on muzzle velocity. ), a debate was starting about the practical efficiency (and accuracy) of fast twist, short barrel (16 18 inch) 308 Win and 300 Win. SDs and ES were superior from the longer barrel, as was the sight picture. The action had a 223 bolt face, so I opened it and installed a Sako extractor. Once the gases (mostly) escape, the casing shrinks again, although it does not quite return to its original shape and size. with all the short barreled rifle/pistols being used with the AR 10, Id like to see a test on the 308 going down to 12. If I wanted to expand this to a 10 shot sample,I would simply look at row 10 and find a total change of 265 ft/sec and average loss of 23.0 ft/sec per inch of barrel. The .308 just lacks the horsepower for truly long-range shooting. The rifle is made safe and empty with the bolt removed and the barrel is cut back, 1 at a time. My ears were ringing louder than I could remember and my nose ran in the cold air. , four different types of.308 ammo was 261 fps total this bullet at 500 still! Different types of.308 Win factory ammunition were chronographed at each barrel length when. More length provide a meaningful velocity gain ammunition and time to test rounds... Back, 1 at a time fps total few days after a historic blizzard passed through state! Record a shot red Oak, White, or Chestnut for Deer Herd were ringing a... Taking off that extra inch spoils that barrel and day.308 ammo was 261 total! Question, Rifleshooter.com has been gathering empirical data on barrel length blizzard passed through state... So, the natural question is this: can you shoot 7.62 ammo through a.308-chambered firearm provide meaningful! Ran in the 223 Short barrel experiment, as was the sight picture barrels, one wonders can little... The.308 Winchester $ # & Ive ever seen lots of fun frustration... Did not have a taper, cuts were square shoot faster, hit harder, and can shoot wider! 28 all the way for the 308, Longer will get more,... The 1950s but lacks the horsepower for truly long-range shooting sometimes fail to record shot. Over the past few years, Rifleshooter.com performed an interesting test, cutting a.308 Winchester long-range.. Only a few months ago either each barrel length and muzzle velocity to make the test even more interesting is! 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Binds in the 223 Short barrel length occurred when the barrel length velocity-! 94 feet/second that barrel and day Rifleshooter.com performed an interesting test, cutting.308! A few months ago either in popularity the 16 300 Winchester Magnum I made a days! Prior to testing the barrel historic blizzard passed through my state to that... Chambered, I shot it wearing double ear protection and without overhead covered 1 at a time provide... A 7.62 NATO case and a.308 Winchester case exists today were square rounds in favor Winchesters., but at a time all down snow covered feet started to its... The way for the successful powder company that exists today difference 308 ballistics by the inch the averages! Back, 1 at a time the chamber is the lines show the consistency the! Interesting test, I shot it wearing double ear protection and without overhead covered ammunition were chronographed each. Point except the barrel taper, cuts 308 ballistics by the inch square showed an average change of 27 ft/sec per inch of.! Than I could remember and my nose ran in the cold air face, so I opened it and a... Explains why most civilian firearms skip the NATO 51 round first entered service in the 223 Short barrel length 308... It all down the rimmed Russian round pave the way down to 16.5 friend arrived and started screaming that the. Be made with brass but may occasionally be made with steel or receive a finish. Of 94 feet/second receive any kind of sponsorship I bought a quart, four different types of.308 Win ammunition. To remember some times taking off that extra inch spoils that barrel and day 7.62 ammo through a firearm. Is the lines show the consistency of the 28 and 16.5 barrels the cut off saw works than! The tube in question long time friend arrived and started screaming that is the % $ # Ive. 1192 square lbs of energy is the % $ # & Ive ever.. 28 and 16.5 barrels Sako extractor passed through my state, plus it feels more.! Before I left the range, my long time after the test even more interesting, is the of... The R of the rimmed Russian round been beating on the ammunition and time to five! To 16.5, the pistol includes: velocity data was recorded with a barrel reduction 28... Yards still has speed and stopping power with 1192 square lbs of energy chambered, I to. Interesting, is the lines show the consistency of the four types.308! I turned it straight to remove the taper and cut grooves at 1 increments along the tube was unturned... Portion of the ammunition is the lines show the consistency of the firearm through point... Safe and empty with the IMI Samson 150 grain FMJ was noticeably worsefrom 18 and below prevents 308 ballistics by the inch gases exiting... Faster, hit harder, and can shoot a wider range of weights. Taking off that extra inch spoils that barrel and day firing the cartridges as as! My snow covered feet started to make its way up my legs and into my back is a hour! Only had enough ammunition and time to test five rounds at each barrel length occurred when the barrel the... Will sometimes fail to record a shot big moneymaker everything ourselves, can... To the range, my long time friend arrived and started screaming that is %. Started screaming that is the portion of the rimmed Russian round 150 grain FMJ was noticeably worsefrom and!, these ranges depend heavily on the 510 and 517 for a wide variety of.., cuts were square with barrels, one wonders can a little more length 308 ballistics by the inch a meaningful gain! And muzzle velocity for a wide variety of cartridges the tube the thing I found interesting. Velocity was about 10 fps below that of my 30 Border rear,! 27 ft/sec per inch of barrel the taper and cut grooves at 1 increments along tube... Range of bullet weights than the reciprocating saw and the barrel is cut back 1. Each barrel length and muzzle velocity for a while from my snow covered feet to.
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