308 ballistics by the inch

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 . 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). .277 Fury has a -41 inch drop at 500 yards . CLICK HERE to Read the Rifleshooter.com Test. The Winchester 180 grain Power-Point load lost 364 feet/second as the barrel length decreased from 15 to 9. 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. 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. 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. The barrel was cut off using a cold saw. ), a debate was starting about the practical efficiency (and accuracy) of fast twist, short barrel (16 18 inch) 308 Win and 300 Win. We did all the work. Registration on or use of this site constitutes acceptance of our Terms of Service. Stay safe, yall! 7.62 NATO chambers are designed to handle slightly lower pressure rounds with thicker case walls and a longer headspace. That said, we wouldnt make a habit of it. By adding trajectories to the panel on the right you may produce charts and graphs that show the different trajectories side by side. The test protocol was repeated for the next length. Ive had small screws fall out of the Jewel HVRs I use on some of my match guns. In the good old days of Precision Shooting magazine (how we miss you! This was with Varget powder. All shooting was done from a bench, with a Sinclair rest and rear bag. I selected the Winchester Super-X 180 grain Power-Point as a representative hunting cartridge. 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. Would be interesting to find out. Welcome Welcome to Ballistics By The Inch, or 'BBTI' as people have taken to calling it. First, lets talk about pressure. You can then also add atmospheric conditions and angles. 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. This allows it to keep a supersonic muzzle velocity at 1,000 yards. While using calipers to measure the walls of fired brass may cause less than conclusive results, the scale doesnt lie. At each barrel length, the rifle was fired from a front rest with rear bags, with five rounds of each type of ammunition. 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). Get the latest in military news, entertainment and gear in your inbox daily. 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. 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. If you have a modern .308 Win. The gun and support equipment werent in much better shape. Please seeModular Driven Technologies (MDT) LSS Chassis Review. 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. var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); Velocity loss can be more extreme with shorter barrel lengths (and bigger cartridges). Click on each to just browse the charts, click on a given ammunition type listed in the header of each chart for a graph of how that particular ammunition performed, or you can download the raw data for your own use. Prior to testing the barrel, I turned it straight to remove the taper and cut grooves at 1 increments along the tube. So, the natural question is this: can you shoot 7.62 ammo through a .308-chambered firearm? He declined. The bottom picture is the first group I shot with the rifle, 5-shots, .785 including cold bore. Wind Direction is: 3.0 o'clock and a Wind Velocity of: 10.0 Miles per hour. Cartridge casings are most often made of brass due to its elasticity and plasticity. When we cut our 6mmBR barrel down from 33 to 28, we only lost about 8 FPS per inch. 20" seems to be ideal for the 7/08 and the 308. from 18" to 20" on a 7/08 I gained almost 200 ft/sec. Your trustworthy Task & Purpose editorial staff is here to clear things so you can stop worrying about blowing your nose off each time you go to pull the trigger. Velocity loss can be more extreme with shorter barrel lengths (and bigger cartridges). 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! The average velocity loss per inch, for all four ammo types combined, was 22.7 FPS. You can find This weight is more appropriate for whitetail deer and other small-medium sized game. Here are some pics: I get this every so often. Drop (Inch) / 0-3.6: Our next 308 Win ballistic chart shows 130 grain Varmint & Predator rounds. Of course, this all takes place within mere fractions of a second. I will actually contour what is left and use it on a custom build. on each to just browse the charts, click on a given ammunition type listed in the header of each chart 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. This results in a ruptured case which can cause significant damage to your magazine, chamber, and/or person. the cylinder gap. The heavier weight and newer designed 175gr Sierra . No guessing, no models, no arbitrary numbers. 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. A. The NATO 51 round first entered service in the 1950s but lacks the R of the rimmed Russian round. It fires a .312-inch-diameter bullet as opposed to a .308-inch-diameter bullet and operates at 45,000 psi as opposed to 40,000. 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. When youre at the range or in the field, always make sure to keep a tourniquet and other critical medical gear on hand. The brand new, factory AI AICS magazine also flew apart as few times. By using the same barrel, I controlled for bore size, chamber, and headspace- all of which will impact velocity. Since the barrel was an unturned blank and did not have a taper, cuts were square. It says that at around the halfway point of 500 yards the bullet will have slowed by 900fps and while that may sound bad it really isn't in terms of a percentage of initial velocity compared to say the .223 Remington (would be 1481fps from initial 3214fps) or the 7.62x39mm (would be 1066fps from initial 2349fps). The action had a 223 bolt face, so I opened it and installed a Sako extractor. this insane project much more practical. 300 Winchester Magnum: How Does Barrel Length Change Velocity- A 16 300 Win Mag? SeeMagnetoSpeed V3 versus Oehler 35P: Chronograph comparison and review. To learn more about the LSS and other MDT products, click here to visit their website. At 55 grains, its bullet achieves 3,910 fps; at 100 grains, 2,960 fps. (Yes, grains are an actual measurement of weight.). 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. 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. 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. Each cartridge wasfired five times at each barrel length and its velocity and standard deviation recorded. 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. was measured from the end of the barrel back to the breech face. With tunning accuracy is 99.7%. Compare the above rates of loss to those found in 308 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 Velocity was about 10 FPS below that of my 30 Border. 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. 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. As noted in the 223 short barrel experiment, as the barrel length decreases, the chronograph will sometimes fail to record a shot. We also have a 223 and 7 rem mag up there. This is how semi-auto 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. 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. 28 barrel ft/sec and 16.5 barrel ft/sec represents the velocity data for the specific shot number. The chill from my snow covered feet started to make its way up my legs and into my back. The .308 just lacks the horsepower for truly long-range shooting. The average data for these four shot data sets is recorded in the table above, as well as the tables below. Thank you. A. Since muzzle velocity is dependent on pressure, temperature and volume, I attempted to control as many variables as possible given my setting and equipment. IMI 150 grain FMJ 7.62x51m NATO data was gathered down to a 6 barrel length. AVG change ft/sec shows the difference between the running averages of the 28 and 16.5 barrels. This was an average decrease of 73.1 feet/second per inch of barrel length. In addition to riding on the back of the 7.62 NATOs short-lived military career, the .308 took advantage of its ballistic and performance similarities to the already venerated .30-06 Springfield, the cartridge that won two world wars and held the line in Korea. 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. This resulted in a velocity loss of 118 feet/second. .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. UPDATE 12/30/14: I tapered the barrel and installed a brake. This could have some potentially expensive consequences. ga.src = ('https:' == document.location.protocol ? The rifle is fired at 100 yards, from a bipod with a rear bag, for 5-rounds. The cuts were made in one-inch intervals with a rotary 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. (function() { Thanks for the kinds words about the 308 and 300 Win barrel length posts. That works out to an average loss of 22.7 fps per inch. site designed and maintained by Coeurbois Graphic Design. The short answers to these questions are yes and maybe. With the .30 caliber bullet diameter being translated as 7.62 millimeters, the new 7.62x51mm cartridge was born. In the next frame you can see the gun recoiling (below). The latter has nearly twice the propellant, and is therefore better able to fell very distant game. For more on sample size, see the discussion here. If the stop mechanism binds in the narrow [], Precision rifle competitions seem to be rapidly expanding in popularity. of this rather nutty project. 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. At 10-inches, muzzle velocity hasn't reached its peak. Besides the time, I havent noticed any burrs (real or imagined) left by the saw affecting the velocity of the bullets. 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. I used my iPhone to record a couple shots being fired in slow motion. Obviously, the amount of pressure a thin-skinned brass or steel casing can withstand is incredibly immense. One note: in every case with the T/C Encore the length of the barrel cartridge is also about .2-inch shorter. Yes, I am very impressed. ga.src = ('https:' == document.location.protocol ? lb Muzzle Velocity ft/sec. 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. Shooting 320 rounds off a chassis on your first outing you get a feel for things. 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. That is actually not correct. To make the test even more interesting, four different types of .308 Win factory ammunition were chronographed at each barrel length. This video from our friends over at Brownells have just what youre looking for. To make the test even more interesting, four different types of .308 Win factory ammunition were chronographed at each barrel length. Cases are most often made with brass but may occasionally be made with steel or receive a nickel-plated finish. Would be more interesting to see maybe 35 barrel down to 28 Have always heard that barrels quit increasing in velocity after 34. This cartridge has enjoyed a massive following from both the military and civilian market. I contribute this to the differences in barrel and headspace tolerances. 7.62x51mm) and .308 Winchester the same thing? This calculator will produce a ballistic trajectory chart that shows the bullet drop, bullet energy, windage, and velocity. The rifle used to record data from 26 to 16.5 inches (above). Copyright GunData.org 2015 | Koenig Media, LLC | Links | Sitemap | Advertise. The test protocol was repeated for the next length. Read on, and it will all make sense. All in all, this was a very thorough test by the folks at RifleShooter.com. Powder burn rates can also make a difference. recording sheets. Acknowledgements. I think data sets are great. Anyone who uses our data owes him or 7.62 NATO ammo. How much velocity do you think was lost, on average, for each 1 reduction in barrel length? This was an average decrease of 77.6 feet/second per inch of barrel length. As a Wildcatter it gets more so! This resulted in a velocity loss of 106 feet/second. Increasing this sample size would increase the reliability of these results. The IMI 150 grain FMJ 7.62x51mm NATOload lost 735 feet/second as the barrel length decreased from 15 to 6. While there are differences between the amounts of pressure generated by each round, the nominal difference is around 12,000 PSI, although in practice, that number is closer to 4,000. I tried to select a cross section of cartridges that would be of interest to a wide variety of shooters. Note the change in MPBR averages 27 yards with an 11.5 inch change in barrel length.

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