A. 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. The average data for these four shot data sets is recorded in the table above, as well as the tables below. 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. JHP: Cor Bon 225 gr. 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. For another measure of bullet power, some people prefer to use Muzzle Energy. This resulted in a velocity loss of 94 feet/second. Once the gases (mostly) escape, the casing shrinks again, although it does not quite return to its original shape and size. Need help keeping it straight? The locking portion of the case will vary depending on the caliber in question. The 180 grain .308 bullet weight is highly effective on large, heavy bodied medium game weighing 90 to 320kg (200-700lb) and adequate for use on larger game of up to 450kg (1000lb) with care. With tunning accuracy is 99.7%. With the .30 caliber bullet diameter being translated as 7.62 millimeters, the new 7.62x51mm cartridge was born. By ammo type, the average loss per inch was: 24.6 (Win 147 FMJ), 22.8 (IMI 150 FMJ), 20.9 (Fed GMM 168gr), and 22.5 (Win 180PP). Out of the 4 recording I made, only two frames contained muzzle flash. CLICK HERE to Read the Rifleshooter.com Test. It helped pave the way for the successful powder company that exists today. 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. Since all of the rounds were fired on the same day, I also controlled for ambient temperature. You can then also add atmospheric conditions and angles. 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. 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). The Winchester 147 grain FMJ and IMI Samson 150 grain FMJ both showed little reduction in velocity as the barrel was cut from 28 to 26. The barrel was cut off using a cold saw. 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. We (well, Jim K, 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. They were fairly close. Last week I found out Cerakote has a color called USMC Red. We also have a 223 and 7 rem mag up there. contrast, the chamber pressure of 5.56 NATO is only roughly 75% of that, at about 60,000 PSI, while 6.5 Creedmoor and .308 Win have only slightly higher chamber pressures at 62,000 PSI. It was only a few days after a historic blizzard passed through my state. Note the change in MPBR averages 27 yards with an 11.5 inch change in barrel length. While the external dimensions of both 7.6251 and .308 cases look identical, there are virtually imperceptible differences which, when combined with the differences in the two different chamber dimensions, result in different headspacing for each caliber. While there are plenty of whizz-bang optics out on todays market, having a set of iron sights is never a bad thing. Fear not. 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). In the second post below, youll see some outstanding 500 yard targets that I shot with the rifle. The 30-30 Winchester 150 gr. Contrary to the popular urban legend, 7.62 NATO casings do indeed have thicker walls than .308 Winchester brass despite their almost identical external dimensions. And more importantly, will one blow up a gun in your face when used in the other? No further tests will be conducted, but we will maintain this site and data for the use of A cartridge shoulder is the angled portion of the case close to the base of the projectile. 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. So what works best? Good ergonomics, and a great value for the money. Initially we intended to test both 9mm and .45ACP cartridges for this sequence. Temperature was 47 F.. 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. I may wear a lab coat to kick things up another notch next time. 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. December 27, 2014 on each to just browse the charts, click on a given ammunition type listed in the header of each chart Welcome Welcome to Ballistics By The Inch, or 'BBTI' as people have taken to calling it. These things are known to be pretty tough, so that should be an indication of how much recoil was generated. Compare the above rates of loss to those found in308 Winchester / 7.62x51mm NATO: Barrel Length versus Velocity (28 to 16.5), where the Winchester 147 grain FMJ averaged 24.6 feet/second per inch of barrel, IMI 150 grain FMJ averaged 22.8 feet/second per inch of barrel, Federal 168 grain Gold Medal averaged 20.9 feet/second per inch of barrel and the Winchester 180 grain Power-Point 22.5 feet/second per inch of barrel. The bolt action pistol with a 5 barrel (above). 7.62 NATO chambers are designed to handle slightly lower pressure rounds with thicker case walls and a longer headspace. Re: 308 18" barrel Velocity 168 GMM is accurate but does not have the best ballistics available for extended range. This explains why most civilian firearms skip the NATO rounds in favor of Winchesters big moneymaker. The test protocol was repeated for the next length. Yes, I guess I did. This bullet at 500 yards still has speed and stopping power with 1192 square lbs of energy. var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); .308 Winchester (7.62mm NATO), If you liked this postsubscribe to this blog (top right corner of page). Articles may contain affiliate links which enable us to share in the revenue of any purchases made. Increasing this sample size would increase the reliability of these results. Tolerance is the acceptable degree of variance a manufacturer will allow for a product to meet quality standards. It will a produce a line graph showing the bullet drop and flight path of the bullet. 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. Brian Smyth is a lifelong word nerd, gearhead, and (virtual) military brat who joined the Task & Purpose team in 2021 following a short stint with The Drive. I think the value of this data is worth the time, effort and expense. 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. He declined. Try these too.. A. Ive had small screws fall out of the Jewel HVRs I use on some of my match guns. How to Sight in a Scope - Step by Step Guide. a debt of gratitude. Much Different Results with 6mmBR and a Longer Barrel 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. Did it really hurt to shoot a short 308 pistol? 308 Winchester: BBA JHP: 175: 2832: 2700: 308 Winchester Built with parts from Brownells, the pistol includes: Velocity data was recorded with a MagnetoSpeed barrel mounted ballistic chronograph. According to multiple non-scientific studies, the average .308 case weighs in around 160 to 170 grains each, while 7.62 brass usually comes in at over 180 grains apiece. Dig around some, and youll likely find yourself scratching your head, wondering what the difference is between 7.62 and .308 rounds. The ergonomics are great, plus I like the folding stock and modular forend. Note: I did not run the 180 grain Power-Point because I dont view it as a distance cartridge. AVG 28 ft/sec and AVG 16.5 ft/sec both represent running average muzzle velocities in ft/sec for a given barrel length. Yes, I am very impressed. Drop (Inch) / 0-3.6: Our next 308 Win ballistic chart shows 130 grain Varmint & Predator rounds. Mag. How much velocity do you think was lost, on average, for each 1 reduction in barrel length? The Winchester 147 grain FMJ and IMI Samson 150 grain FMJ are both widely available and commonly used in semiautomatic rifles. 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. These seem much more durable over the long run. Are 7.62 NATO (a.k.a. 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. Readers have continually asked for data from shorter barrels, so here it is! Ballistics and Drop for the .308 Winchester (7.62mm NATO) Cartridge Type: Rifle Height: 2.015" Width: 0.473" Average FPS: 2681 Average Energy: 2617 Average Gr: 164 Recoil: 1.95 Power Rank: 4.4 of 20 The .308 Winchester / 7.62x51mm NATO was created in 1952 and is based on the .300 savage round a round created in 1920. The initial testing was done in 2008 and tested the velocity of 13 common handgun cartridges as it related to firearm barrel length. .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. 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. 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