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This chart shows velocity changes for all four ammo varieties: Summary of Findings: The average velocity loss per inch, for all four ammo types combined, was 22.7 FPS. 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).
Cutting the barrel from 28″ to 16.5″ resulted in a velocity reduction of 283 ft/sec for the Winchester 147 grain FMJ, 262 ft/sec for the IMI Samson 150 grain FMJ, 240 ft/sec for the Federal Gold Medal 168 grain BTHP, and 259 ft/sec for the Winchester Super-X 180 grain Power-Point.
Yes, the .308 Winchester cartridge was designed with a 22- to 24-inch barrel in mind. You can gain a small amount of velocity by using a longer 26- or even 28-inch barrel, but the gains tend to be small.
The data was summarized in 308 Winchester / 7.62x51mm NATO: Barrel Length versus Velocity (28″ to 16.5″). This post provides Rifleshooter.com’s readers the complete data set for Federal 308 Winchester Gold Medal 168 grain Matchking BTHP ammunition.
An in-depth look at 308 ballistics including a ballistic chart with velocity, energy and bullet drop data for popular loads in the U.S.
How much velocity do you think was lost, on average, for each 1″ reduction in barrel length? The answer may surprise you. With a barrel reduction from 28″ to 16.5″, the average speed loss of the four types of .308 ammo was 261 fps total.
In 308 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″. Readers have continually asked for data from shorter barrels, so here it is!
Find 308 ballistics charts that include velocity, energy, and bullet drop for major ammo manufactures like Federal, Winchester, and Remington.
For 125-grain .308 ballistic tip hunting ammunition, you’re looking at a muzzle velocity of around 3100 FPS. You’re still sitting at 2,351 FPS at 300 yards, and finally dipping under the 2K mark at 1,900 FPS at 500 yards.
With a 168-grain Gold Medal cartridge in .308, you’ll get a muzzle velocity of 2,650 FPS and 2,103 FPS at 300 yards from a 24-inch barrel. The energy remains over 2,000 ft-lbs at 100 yards and is 1,650 ft-lbs at 300 yards, and 1,179 ft-lbs at 500 yards.