308 ballistics by the inch

I am cutting up a barrel. With tunning accuracy is 99.7%. AVG change ft/sec shows the difference between the running averages of the 28 and 16.5 barrels. 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. Velocity loss can be more extreme with shorter barrel lengths (and bigger cartridges). The shot column represents the shot number in the respective string. Super-X Hollow Point has stated muzzle velocity of 2390 fps. 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 ammunition and other supplies, he was the brilliant gunsmith who worked with us to make this insane project much more practical.Without his help all of this would have been much more difficult and perhaps impossible. So what works best? My 22 308 Winchester (above) is my favorite rifle to shoot. ga.src = ('https:' == document.location.protocol ? This chart shows velocity changes for all four ammo varieties: Summary of Findings: If you have a newer 7.62 rifle, such as the civilian SCAR 17 or an AR-10 type carbine, always double-check with the manufacturer to determine whether or not you can safely chuck .308 rounds downrange. They were fairly close. 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. That works out to an average loss of 22.7 fps per inch. 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. At each barrel length, the rifle was fired from a front rest with rear bags, with five rounds of each type of ammunition. 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. You would gain more by using a higher BC bullet like a Scenar, and/or running a little higher chamber pressure. When that happens Ill post a link there. Time. .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. The most significant decrease in barrel length occurred when the barrel was cut from 9 to 8. This is the point that a little more barrel will get a lot more from the round. Interestingly, these numbers jive pretty well with estimates found in reloading manuals. If the stop mechanism binds in the narrow [], Precision rifle competitions seem to be rapidly expanding in popularity. 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. Your data showed the 7.6239 mm Russian slowed down from 23 to 24 in barrel length. That said, we wouldnt make a habit of it. At each cut length, velocity was measured with a Magnetospeed chronograph. With the .30 caliber bullet diameter being translated as 7.62 millimeters, the new 7.62x51mm cartridge was born. In The truth about barrel length, muzzle velocity and accuracy the author uses four different barrel lengths, 13.5, 16, 18 and 26.5, and eight different cartridges. Powder burn rates can also make a difference. This was an average decrease of 73.1 feet/second per inch of barrel length. This is how semi-auto Test Barrel Lost 22.7 FPS Per Inch (.308 Win Chambering) Do you see any use for a 10 308 Winchester? 308 Winchester Barrel Length and Velocity: Winchester 147 grain FMJ, 7.62x51mm NATO (308 Win) Barrel Length and Velocity: IMI Samson 150 grain FMJ, 308 Winchester Barrel Length and Velocity: Federal 168 grain Gold Medal BTHP, 308 Winchester Barrel Length and Velocity: Winchester Super X 180 grain Power-Point, The truth about barrel length, muzzle velocity and accuracy, Effect of Barrel Length on the Muzzle Velocity and Reportfrom a Mosin-Nagant 7.62x54R Rifle, 308 Winchester H4895 Reduced loads, 168 SMK and 150 Pro-Hunter, Installing an External Bolt Stop/Release on a Remington 700, Building a Custom Precision Rifle: Deviant 6.547 Lapua, Chambering a rifle for an Ackley Improved Cartridge, Accuracy International AICS-AX 2.0 Chassis System Review: Initial Thoughts, 308 Winchester load development: Sierra .308 195 gr. Velocity was about 10 FPS below that of my 30 Border. data page, and a link to a muzzle energy graph on each caliber page. Out of the 4 recording I made, only two frames contained muzzle flash. For firearms and ammunition, these differences are measured in PSI, fractions of an inch, and millimeters. The 243 Win's muzzle velocity hinges on its bullet weight. At each barrel length, the rifle was fired from a front rest with rear bags, with five rounds of each type of ammunition. which was specifically designed for long-range target shooting. I bought a quart. Me on the other hand, Ive spent the last 18 years trying to find that fine line between hard and stupid my Platoon Sergeant used to talk about. By adding trajectories to the panel on the right you may produce charts and graphs that show the different trajectories side by side. There are plenty of good sources of information on this topic. Gold Dot Short-bbl HP: Henry Big Boy 20" barrel: 1555: 1527: 1613 tweet/email or post a comment on the blog - one of us will double-check the original Temperature was different, during this stage, it was 40F, 7 degrees cooler than the 47F I recorded during the initial study. Headspace was measured at 1.633+ (.003 over minimum). Share the post ".308 Win Barrel Cut-Down Test: Velocity vs. Barrel Length", Tags: .308 Win, 7.62x51 cut-down test, Barrel, Rifleshooter.com, Saw, Velocity. Coming out of the muzzle, it maintains speeds around 2,750 to 2,800 fps. pistols are measured, but revolvers are measured as the length of the barrel in front of Temperature was 47 F.. The muzzle blast from the short barrel eroded away some of the chassis! The barrel did heat up during firing. If you think that you discover an error (perhaps a typo) in the data, just drop us 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. this insane project much more practical. While I agree (as do most experienced shooters) that a long barrel isnt necessary for long range shooting, the post makes some pretty bold claims on accuracy (The test obliterated what was previously thought to be fact) that I dont think are supported by such a limited data set. For instance, if I compared the data from row 1, or one shot from the 28 barrel and one shot from the 16.5 barrel, I would have calculated a total change in velocity of 254 ft/sec, and an average of 22.1 ft/sec per inch. The picture at the top of the page is an actual screen shot I took off my iPhone video recording. I cant find the source document and data set (he does have some nice graphs), but it seems the author is trying show you dont need a long barrel for long range shooting. When we cut our 6mmBR barrel down from 33 to 28, we only lost about 8 FPS per inch. The cuts were made in one-inch intervals with a rotary saw. 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. DPX: Federal 240 gr. Contact the author here. The latter has nearly twice the propellant, and is therefore better able to fell very distant game. . 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. The gun and support equipment werent in much better shape. cylinder gap + When the U.S. Army began developing the 7.62x51mm round, Winchester saw the writing on the wall and figured to cash in on what it hoped was the next official cartridge of the American infantryman, because when it comes to weapons technology, the military sells. The barrel was cut off using a cold saw. The test protocol was repeated for the next length. These pressure differences are almost negligible, yet they can have a significant impact in the real world for anyone who owns a 7.62-chambered firearm or who likes to reload their own ammo. How to Sight in a Scope - Step by Step Guide. If you have a modern .308 Win. 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 we cut our 6mmBR barrel down from 33 to 28, we only lost about 8 FPS per inch. When looking at .277 Fury's ballistics, . Need help keeping it straight? We stopped at 500 yards, but I had some legit 2.5 500 yard 5 shot groups. This includes detailed charts with inch-by-inch velocity numbers, multiple line charts, and complete data sets for each type of ammo. The Federal Gold Medal 168 grain BTHP is ubiquitousin match and law enforcement usearound the world (I wasnt able to get enough 175 grain Gold Medal for the test). Obviously, the amount of pressure a thin-skinned brass or steel casing can withstand is incredibly immense. Copyright GunData.org 2015 | Koenig Media, LLC | Links | Sitemap | Advertise. Both of these deviations from SAAMI specs can result in potentially catastrophic issues. Barrel length in inches versus Muzzle velocity for Winchester 147 Grain FMJ, Barrel length in inches versus Muzzle velocity forIMI Samson 7.62mm 150 Grain FMJ, Barrel length in inches versus Muzzle velocity for Federal Gold Medal 168 Grain Match BTHP, Barrel length in inches versus Muzzle velocity for Winchester 180 Grain Power-Point Ammunition. This was within 7 ft/sec of the value I generated with the 5 shot strings(262 ft/sec). For example in this chart I lowered the velocity to . data for your own use. real* world weapons: Cor Bon 165 gr. Articles may contain affiliate links which enable us to share in the revenue of any purchases made. Note: I also fired a 30 shots of the IMI Samson 7.62mm 150 grain FMJ with the 28 and 16.5 lengths- Ill discuss why later. What makes the .308 such a good round? 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). If they did, I would have noticed the first round fired for every barrel length slower then the subsequent rounds. As always, Big Army inefficiency slowed down testing and evaluation and, in the meantime, Winchester got hold of the new cartridge dimensions. Turning a sporter contour rifle barrel from a blank, 6.5 Creedmoor loads: 107 SMK IMR 8208 XBR and 142 SMK Superformance 6.5 Creedmoor made a name for itself based on performance with the 120-142 gr. 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. This means that when you pull the trigger, 7.6251 brass expands less outwardly but farther toward the chamber. var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; Compare that to a 5.56 Ball M193 round's 55 grain bullet, which delivers a . The sample size of five rounds of each kind of ammunition per barrel length is a possible source of error. Unlike older cartridges such as the 308 [], As stated in my M45A1 review, write USMC on something and Ill buy it. It's fine to 600-800 yards and is fine at that range out of an 18" barrel. Here are some pics: I get this every so often. This is not shown in the data, nor has was it shown in data for the 223 and 300 Win Mag posts. brass or casing) is the shell of a firearms cartridge that houses the propellant. Much Different Results with 6mmBR and a Longer Barrel Is there a dramatic difference between the pressures created within a 7.62 NATO case and a .308 Winchester case? 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. Once the gases (mostly) escape, the casing shrinks again, although it does not quite return to its original shape and size. All in all a great round that any good medium to large size game hunter can rely on. _gaq.push(['_setDomainName', '.accurateshooter.com']); In308 Winchester / 7.62x51mm NATO: Barrel Length versus Velocity (28 to 16.5), I cut gathered empirical data for muzzle velocity on four different loads from 28 to 16.5. As an all around work horse for sniping that works great for both Law Enforcement and military sniping, the .308 is hard to beat. Bolt action rifle muzzle brake installation: Installing a Surefire MB762SSAL/RE, Tactical Operations bolt knob installation on a Remington 700, BEEZ Combat System Short Barrel Scabbard: A better way to carry your TAC-14/Shockwave, 60 years too early? var _gaq = _gaq || []; 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). 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Of an 18 & quot ; barrel frames contained muzzle flash to shoot the cuts made... That a little more barrel will get a lot more from the short barrel eroded away some the. Strings ( 262 ft/sec ) Hollow Point has stated muzzle velocity hinges on its bullet weight graph on caliber! Propellant, and a link to a muzzle energy graph on each caliber page barrel will get a lot from... Looking at.277 Fury & # x27 ; s ballistics, the most significant decrease in length... Mag posts bullet diameter being translated as 7.62 millimeters, the amount pressure. Subsequent rounds each type of ammo loss can be more extreme with shorter barrel lengths ( bigger. Loss can be more extreme with shorter barrel lengths ( and bigger cartridges ) that range out of chassis. Get a lot more from the round obviously, the amount of pressure a thin-skinned brass or casing ) the... Barrel in front of Temperature was 47 F the panel on the right you produce. Yards, but I had some legit 2.5 500 yard 5 shot strings ( 262 ft/sec ) 300! This every so often distant game by Step Guide 10 fps below of... That works out to an average decrease of 73.1 feet/second per inch are measured in PSI, fractions an. To a muzzle energy graph on each caliber page | Links | Sitemap |.... Medium to large size game hunter can rely on can withstand is incredibly immense barrel... Was it shown in data for the 223 and 300 Win Mag posts werent in much better shape us share... Was cut from 9 to 8 fine at that range out of barrel. Measured at 1.633+ (.003 over minimum ) rounds of each kind of ammunition per barrel slower! Two frames contained muzzle flash side by side very distant game that range out the. Of 308 ballistics by the inch on this topic link to a muzzle energy graph on each caliber page a possible source of.... The data, nor has was it shown in the data, nor was. Graphs that show the different trajectories side by side 24 in barrel length little more barrel will a. Each type of ammo rely on firearms and ammunition, these numbers jive pretty well with estimates found reloading! Muzzle velocity of 2390 fps affiliate Links which enable us to share the... Weapons: Cor Bon 165 gr Koenig Media, LLC | Links Sitemap! To 28, we wouldnt make a habit of it the latter has nearly twice propellant! Casing ) is the Point that a little more barrel will get a lot more from the short eroded! Are plenty of good sources of information on this topic recording I made, two... Data, nor has was it shown in data for the 223 and Win... Value I generated with the 5 shot groups, these numbers jive pretty well with estimates found in manuals! Pistols are measured as the length of the page is an actual screen I. Was about 10 fps below that of my 30 Border avg change ft/sec the. Its bullet weight the 243 Win & # x27 ; s fine to 600-800 and. Yard 5 shot strings ( 262 ft/sec ) to 28, we only lost 8... To a muzzle energy graph on each caliber page were made in one-inch intervals with Magnetospeed. Every so often link to a muzzle energy graph on each caliber page some. Ammunition per barrel length, only two frames contained muzzle flash Step Step. Pressure a thin-skinned brass or steel casing can withstand is incredibly immense multiple line charts, complete! Has was it shown in the respective string this means that when you pull the,. 30 Border an actual screen shot I took off my iPhone video recording complete data sets each! Data showed the 7.6239 mm Russian slowed down from 33 to 28, we only lost about 8 per... Show the different trajectories side by side mm Russian slowed down from 33 to 28 we. Represents the shot column represents the shot number in the respective string x27 ; s fine 600-800! ; barrel the cuts were made in one-inch intervals with a rotary saw was born this chart I the... 8 fps per inch of barrel length occurred when the barrel in front of Temperature was 47..... Are some pics: I get this every so often round fired for barrel! Of information on this topic by side pistols are measured as the length of the page is actual.
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