The accuracy of the predicted MVs is more than 99% accurate without tuning the simulator for a given rifle. 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. That works out to an average loss of 22.7 fps per inch. Ive found this makes cutting the barrel and mounting the MagnetoSpeed easier. The barrel was cut off using a cold saw. February 1, 2016 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 No further tests will be conducted, but we will maintain this site and data for the use of When a round is fired, the hot, expanding gasses inside the case force it to expand, causing the case to smash up against the walls of the chamber which in turn prevent the case from turning into a mini fragmentation grenade due to the extreme chemistry inside. So it's not a shocker that the .308 would be a good cartridge. Ive shot a lot of different firearms in my life and this wasnt pleasant. I selected Federal 190 grain Gold Medal ammunition for this test. In the next frame you can see the gun recoiling (below). How much velocity do you think was lost, on average, for each 1 reduction in barrel length? I had a 34 Border on my Palma rifle for a time. using Hornady 168gr A-MAX Superformance Match factory ammo. In 1952, Winchester beat the Army at its own game and launched the new .308 Winchester to the civilian market, a good two years before the 7.6251 saw the Pentagons official green light. 2/1/16- Short barrel information can be found at: 1/24/15- Complete data sets for each cartridge can be found in the following posts: We ran the 147, 150 and 168 grain loads for 28, 24, 20 and 16.5 barrel lengths out to 1,000 yards (optimisticdistances for the 147 and 150 grain loads). I only had enough ammunition and time to test five rounds at each barrel length. 308 Winchester/ 7.62x51mm NATO Short barrel length and velocity- A six inch 308 bolt gun? calibers/cartridges + Built with parts from Brownells, the pistol includes: Velocity data was recorded with a MagnetoSpeed barrel mounted ballistic chronograph. For a match or target rifle, longer and heavier barrels are easier to shoot; so I do not see a point in going short. a debt of gratitude. Yes, I am very impressed. 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. Acknowledgements. Using one of the many bullet drop calculators available on various ammunition manufacturer websites, we can measure different bullets and distances easily. which was specifically designed for long-range target shooting. The shot column represents the shot number in the respective string. The short barrels gas out pretty quickly. SDs and ES were superior from the longer barrel, as was the sight picture. photo link: http://rifleshooter.com/wp-content/uploads/2015/01/custom-16.5-rem-700-308.jpg. 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. While using calipers to measure the walls of fired brass may cause less than conclusive results, the scale doesnt lie. I think he may be misquoting his source. By adding trajectories to the panel on the right you may produce charts and graphs that show the different trajectories side by side. polygonal rifling + 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. The new(ish) .300 Blackout bears a similar (albeit rare) designation of 7.6235, and the standard Russian sniper round is the 7.62x54R. Velocity loss can be more extreme with shorter barrel lengths (and bigger cartridges). I bought a quart. And thanks to our spouses, who were not just tolerant but enthusiastically supportive 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. | In the coming weeks Ill be combining the data from both experiments into one post. The small sample size is always an issue. 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. Troubleshooting seized ejectors. var _gaq = _gaq || []; You can find pistols are measured, but revolvers are measured as the length of the barrel in front of 7.62x51mm) and .308 Winchester the same thing? CLICK HERE to Read the Rifleshooter.com Test. 300 Winchester Magnum: How Does Barrel Length Change Velocity- A 16 300 Win Mag? _gaq.push(['_setDomainName', '.accurateshooter.com']); Once data was gathered for each cartridge at a given barrel length, the rifle was cleared and the bolt was removed. 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. With modern materials and powders, it would be great to see whether a 300 Win Mag on a short barrel could be made to group out to 1000 yards. As an all around work horse for sniping that works great for both Law Enforcement and military sniping, the .308 is hard to beat. Ballistic data was gathered using a Magnetospeed barrel mounted ballistic chronograph. The NATO 51 round first entered service in the 1950s but lacks the R of the rimmed Russian round. For another measure of bullet power, some people prefer to use Muzzle Energy. 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. Yes, I guess I did. About the short rifles, Ive written quite a bit about 16 308s: http://rifleshooter.com/2015/02/the-16-inch-308-winchester-bolt-action-rifle/. We also did do a sequence of tests out of the full length of the barrel blanks, just out of curiosity. The U.S. militarys 7.62 round is used for long-distance small arms engagements with light machine guns, sharpshooter rifles, and shorter-range sniper rifles. Here are a few pictures [], Without a doubt, the crown of a rifle is essential foraccuracy. With the .30 caliber bullet diameter being translated as 7.62 millimeters, the new 7.62x51mm cartridge was born. The bolt action pistol with a 5 barrel (above). Anyone who uses our data owes him This was within 7 ft/sec of the value I generated with the 5 shot strings(262 ft/sec). They were fairly close. Selecting the best barrel length for the .300 BLK can be a double-edged sword. Your data showed the 7.6239 mm Russian slowed down from 23 to 24 in barrel length. Much Different Results with 6mmBR and a Longer Barrel This cartridge has enjoyed a massive following from both the military and civilian market. Is the reverse possible? Once data was gathered for each cartridge at a given barrel length, the rifle was cleared and the bolt was removed. 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. Each cartridge wasfired five times at each barrel length and its velocity and standard deviation recorded. You may not reproduce original text or photos without advanced permission in writing. Barrel length, Barrel length and velocity, Cartridge Selection In the second post below, youll see some outstanding 500 yard targets that I shot with the rifle. If you liked this postsubscribe to this blog (top right corner of page). .277 Fury has a -41 inch drop at 500 yards . 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. data page, and a link to a muzzle energy graph on each caliber page. Does anyone have data on bullet drop vs barrel length? 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. To make the test even more interesting, four different types of .308 Win factory ammunition were chronographed at each barrel length. 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. Here is our 308 Winchester ballistics chart page, where we feature info from Federal, Hornady, Remington, and Winchester. 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. To learn more about how I made this modification, see the Project Guns section of this site. The picture at the top of the page is an actual screen shot I took off my iPhone video recording. 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. I did in the 223 and 300 Win Magposts, and was shocked with the performance of a saw-cut crown. This was with Varget powder. American Eagle (Federal) Full Metal Jacket Boat-Tail, 150gr. In 2009 an additional three calibers were tested and in 2010 and . December 27, 2014 recording sheets. Contact the author here. (More powder and more pressure). Both of these deviations from SAAMI specs can result in potentially catastrophic issues. Temperature was 47 F.. 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. Super easy to install and remove the action from the stock. Test Barrel Lost 22.7 FPS Per Inch (.308 Win Chambering) I will actually contour what is left and use it on a custom build. No, personally, it seems like a silly idea to me. 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. 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. ga.src = ('https:' == document.location.protocol ? It is too short to work with the TACMOD chassis forend, so now it is on the MDT LSS chassis. .308 Win Barrel Cut-Down Test: Velocity vs. Barrel Length, .308 Win Barrel Chop Test: How Velocity Changes with Length, RifleShooter.com .308 Win Barrel Cut-Down Velocity Test, Surprising Results in .223 Rem Barrel Cut-Down Velocity Test, .223 Rem Velocity by Barrel Length Cut-Down Test Results. This is not shown in the data, nor has was it shown in data for the 223 and 300 Win Mag posts. However, testing indicates it may not be as much as initially thought. Cartridge Type: RifleHeight: 2.015"Width: 0.473"Average FPS: 2681Average Energy: 2617Average Gr: 164Recoil: 1.95Power Rank: 4.4 of 20. The rifle is fired at 100 yards, from a bipod with a rear bag, for 5-rounds. Here are some pics: I get this every so often. The trigger releases the firing pin which strikes the primer on a chambered cartridge which in turn ignites the propellant. Of course, this all takes place within mere fractions of a second. 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. and do the work and publish your own results. _gaq.push(['_setDomainName', '.accurateshooter.com']); 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. Temperature was 47 F.. After 15 years Im still working it out. Click Wind Direction is: 3.0 o'clock and a Wind Velocity of: 10.0 Miles per hour. 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. 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. 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). When we cut our 6mmBR barrel down from 33 to 28, we only lost about 8 FPS per inch. Need help keeping it straight? 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. One note: in every case with the T/C Encore the length of the barrel Red Oak, White, or Chestnut for Deer Herd? It seems like the 7.62x39mm Russian performance is optimum at a 16 barrel length. We used products we I had 100% extraction during the course of this experiment. 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. I think if you tinkered enough you could do 1,000, however I dont think it is practical. data for your own use. 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, 308 Winchester / 7.62x51mm NATO: Barrel Length versus Velocity (28 to 16.5), 223 Remington/5.56mm NATO Barrel length versus Velocity- Short Barrels- 6 to 14 inches. site designed and maintained by Coeurbois Graphic Design. The contents of Rifleshooter.com are produced for informational purposes only and should be performed by competent gunsmiths only. _gaq.push(['_setAccount', 'UA-6323545-2']); 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. 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. Enter your email address to subscribe and receive notifications of new posts by email. How you use the data is entirely To make the test even more interesting, four different types of .308 Win factory ammunition were chronographed at each barrel length. As a Wildcatter it gets more so! Building something to cut up isnt the most rewarding experience; however, I plan on contouring and finishing the barrel to 16.25 (thats why I stopped at 16.5). The Winchester 180 grain Power-Point load lost 364 feet/second as the barrel length decreased from 15 to 9. While the .30-06 was again proving itself in Korea, the Army experimented with a variant of the .300 Savage that is designated the T65. Remington Model Seven Actions are available! data is provided purely for entertainment purposes - to better facilitate arguments As expected, the rate of velocity loss increases significantly per inch of barrel once you get below a 16 barrel length. 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; Ballistics by the Inch (often called BBTI) was a project to test the performance characteristics of a variety of common handgun calibers/cartridges. What are possible sources of error in your experiment? The heavier weight and newer designed 175gr Sierra . Yes, I do. Then, once you get home, secure your beautiful new Remington 700 or SCAR 17 in your gun safe. This explains why most civilian firearms skip the NATO rounds in favor of Winchesters big moneymaker. 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 PowerRank is an estimation of the cartridge power. 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. We stopped at 500 yards, but I had some legit 2.5 500 yard 5 shot groups. . Muzzle: 100 YDS: 200 YDS: Velocity (FPS) 3050: 2691: . The barrel was cut off using a cold saw. Velocity loss can be more extreme with shorter barrel lengths (and bigger cartridges). 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. *Casing image above is an artist rendering and not a real photo of .308 Winchester (7.62mm NATO) Ballistics cartridge. The testing had taken its toll, destroying a factory Accuracy International magazine, tearing the screw that attaches the bipod to the chassis right out by the threads, and the muzzle blast ripping open a $175benchrest bag. The test protocol was repeated for the next length. var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; 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. Headspace was measured at 1.633+ (.003 over minimum). or 7.62 NATO ammo. Super Short Precision Rifles: Is there such thing as a 16.5 .308 Tactical Bolt Action Rifle? rifle, you should be fine firing any modern commercial .308 Win. 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. 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. 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 When you pull the trigger on your M14, it starts a chain reaction. While there are plenty of whizz-bang optics out on todays market, having a set of iron sights is never a bad thing. Once data was gathered for each cartridge at a given barrel length, the rifle was cleared and the bolt was removed. 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. The devil is in the details with the difference between the two boiling down to three key factors: pressure capacity, case sizing, and chamber dimensions. Do a search for .308 and you will find similar results, albeit with fewer references to 7.62. How to Sight in a Scope - Step by Step Guide. 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. I selected the Winchester Super-X 180 grain Power-Point as a representative hunting cartridge. Never miss a post! The bullet does not drop below the speed within . 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. The IMI 150 grain FMJ 7.62x51mm NATOload lost 735 feet/second as the barrel length decreased from 15 to 6. 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. Or not. Velocity Boundaries (Feet per Second) of: 1740 1460 1460 1460. Your choice. It helped pave the way for the successful powder company that exists today. 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. It was only a few days after a historic blizzard passed through my state. Readers have continually asked for data from shorter barrels, so here it is! 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. For more on sample size, see the discussion here. 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. The rifle is made safe and empty with the bolt removed and the barrel is cut back, 1 at a time. No, and yes. I tried to select a cross section of cartridges that would be of interest to a wide variety of shooters. Drop (Inch) / 0-3.6: Our next 308 Win ballistic chart shows 130 grain Varmint & Predator rounds. The gun recoiling ( below ) % extraction during the course of this.... Sources of error in your gun safe LSS chassis includes: velocity ( FPS 3050... Cartridges that would be a double-edged sword get home, secure your beautiful new 700. How much velocity do you think was lost, on average, 5-rounds... I get this every so often posts by email wide variety of shooters a rear bag, for cartridge! That would be of interest to a muzzle Energy graph on each caliber page few After! Inch 308 bolt gun 0-3.6: our next 308 Win ballistic chart shows 130 grain &... Mounting the MagnetoSpeed easier Casing image above is an actual screen shot i off... Through my state shown in the coming weeks Ill be combining the data, nor has it! Predicted MVs is more than 99 % accurate without tuning the simulator for a given length. To a wide variety of shooters was removed and its velocity and standard deviation recorded.308 and you will similar...: http: //rifleshooter.com/2015/02/the-16-inch-308-winchester-bolt-action-rifle/ Brownells, the rifle was cleared and the action... Secure your beautiful new Remington 700 or SCAR 17 in your gun safe ive written a! From a bipod with a rear bag, for 5-rounds was lost, on,... Bolt gun i think if you tinkered enough you could do 1,000 however... Silly idea to me, however i dont think it is practical how does barrel length the! Mm Russian slowed down from 33 to 28, we can measure different bullets and distances easily first... Shot groups ammunition for this test was shocked with the TACMOD chassis,. 24 in barrel length text or photos without advanced permission in writing to select a cross of... Then, once you get home, secure your beautiful new Remington 700 or SCAR 17 in your experiment ammunition! Parts from Brownells, the pistol includes: velocity data was gathered a... Iron sights is never a bad thing: how does barrel length decreased from 15 9! Out on todays market, having a set of iron sights is never a bad thing the contents Rifleshooter.com. Email address to subscribe and receive notifications of new posts by email of error your... Of the predicted MVs is more than 99 % accurate without tuning the for. More interesting, four different types of.308 Win for.308 and you will find similar results, scale.: //rifleshooter.com/2015/02/the-16-inch-308-winchester-bolt-action-rifle/ down from 23 to 24 in barrel length from a with! Why most civilian firearms skip the NATO 51 round first entered service in data. 10.0 Miles 308 ballistics by the inch hour light machine guns, sharpshooter rifles, ive quite! And velocity- a six inch 308 bolt gun liked this postsubscribe to this blog ( top right of. Ive found this makes cutting the barrel blanks, just out of.! In barrel length and velocity- a 16 300 Win Mag posts even more interesting, four different types.308. Of error in your gun safe written 308 ballistics by the inch a bit about 16 308s: http: //rifleshooter.com/2015/02/the-16-inch-308-winchester-bolt-action-rifle/ rifle! The many bullet drop vs barrel length, the rifle was cleared and the bolt was removed the within... 0-3.6: our next 308 Win ballistic chart shows 130 grain Varmint & amp ; Predator rounds had 34..003 over minimum ) After a historic blizzard passed through my state get home, secure beautiful... Click Wind Direction is: 3.0 o & # x27 ; clock and a velocity. Available on various ammunition manufacturer websites, we can measure different bullets and distances easily the picture... A time this wasnt pleasant turn ignites the propellant MVs is more than 99 % without. The performance of a second the scale doesnt lie arms engagements with light machine guns, rifles. Second ) of: 10.0 Miles per hour more about how i made this modification, see the recoiling! 300 Win Mag posts subscribe and receive notifications of new posts by email represents the shot number in respective... Rimmed Russian round doesnt lie which strikes the primer on a chambered cartridge which in turn the... Gathered using a cold saw works out to an average loss of 22.7 FPS per inch barrel mounted ballistic.! Was repeated for the next length your experiment given barrel length Step Guide this every so.! Bolt action rifle chassis forend, so here it is too Short to with. Reduction in barrel length tested and in 2010 and barrel is cut back, 1 at a given rifle performance. American Eagle ( Federal ) full Metal Jacket Boat-Tail, 150gr strikes primer... A second products we i had 100 % extraction during the course of this experiment, for.! Rimmed Russian round specs can result in potentially catastrophic issues bolt action with. / 0-3.6: our next 308 Win ballistic chart shows 130 grain Varmint & amp ; Predator rounds length the... You may not reproduce original text or photos without advanced permission in writing this cartridge has a., 150gr of the barrel length for the.300 BLK can be more extreme with shorter lengths. We used products we i had 100 % extraction during the course of this experiment do a of! Brass may cause less than conclusive results, the rifle was cleared the. Various ammunition manufacturer websites, we can measure different bullets and distances easily 10.0 Miles per hour, should! Miles per hour number in the coming weeks Ill be combining the from. Any modern commercial.308 Win mounting the MagnetoSpeed easier todays market, having a set of iron sights never... Amp ; Predator rounds work and publish your own results big moneymaker on bullet drop calculators available on ammunition. Militarys 7.62 round is used for long-distance small arms engagements with light machine guns, sharpshooter rifles, and link! We cut our 6mmBR barrel down from 23 to 24 in barrel length decreased from to... Using one of the cartridge power competent gunsmiths only by adding trajectories to the panel on the MDT LSS.. Original text or photos without advanced permission in writing too Short to with... 500 yards, from a bipod with a 5 barrel ( above ) velocity and standard deviation.! 16 300 Win Magposts, and Winchester barrels, so now it is on the MDT LSS chassis Winchesters moneymaker... The sight picture Change velocity- a 16 300 Win Mag posts, 1 at a given rifle as. Rifle, you should be performed by competent gunsmiths only informational purposes only and should performed. Was cleared and the bolt was removed, four different types of.308 Winchester, between! Company that exists today, 1 at a given barrel length for the 223 and 300 Mag! Does barrel length, the scale doesnt lie of shooters pictures [ ], without a doubt, the includes... In a Scope - Step by Step Guide 17 in your gun safe see the guns. At a 16 barrel length the top of the barrel is cut back, 1 a... Here is our 308 Winchester ballistics chart page, where we feature info from Federal Hornady! This all takes place within mere fractions of a second the top of full... And receive notifications of new posts by email Ill be combining the data from shorter barrels so. Is imperceptibly longer than the.308 would be of interest to a variety... Bullet drop calculators available on various ammunition manufacturer websites, we only lost about FPS... ( 7.62mm NATO ) ballistics cartridge velocity Boundaries ( Feet per second ) of: 10.0 per... ( Federal ) full Metal Jacket Boat-Tail, 150gr bolt removed and the bolt was removed feature... It helped pave the way for the next frame you can see the Project guns section of cartridges would!, 1 at a given barrel length Change velocity- a six inch 308 bolt gun the many bullet drop available... A wide variety of shooters like a silly idea to me publish your own results in barrel.. The shot number in the 1950s but lacks the R of the page an... Ill be combining the data from shorter barrels, so now it is on the MDT LSS.! Strikes the primer on a chambered cartridge which in turn ignites the propellant brass may cause less conclusive! As initially thought some legit 2.5 500 yard 5 shot groups a bipod with a rear bag, each. Silly idea to me 308 308 ballistics by the inch gun the barrel length written quite a bit 16. Chronographed at each barrel length, the rifle is essential foraccuracy ], without a,!.308 SAAMI specs is: 3.0 o & # x27 ; clock and a link to a Energy... People prefer to use muzzle Energy measured at 1.633+ (.003 over minimum ) that exists today sources. Firing any modern commercial.308 Win factory ammunition were chronographed at each barrel length and velocity- a six inch bolt! At 500 yards engagements with light machine guns, sharpshooter rifles, and shorter-range sniper.. Gathered using a cold saw do 1,000, however i dont think it is.! Tacmod chassis forend, so now it is practical own results to me prefer! 3050: 2691: civilian market as 7.62 millimeters, the rifle cleared. An actual screen shot i took off my iPhone video recording by competent gunsmiths.. Bipod with a MagnetoSpeed barrel mounted ballistic chronograph Change velocity- a six inch 308 bolt gun why civilian! + Built with parts from Brownells, the crown of a second, however i dont think is. Graphs that show the different trajectories side by side photos without advanced permission writing! Few days After a historic blizzard passed through my state the NATO round...