Does barrel length matter for 308?
Long barrel length means higher velocity but it also means lower stiffness values. Diameters that are bigger mean greater stiffness but the extra weight isn’t always desirable.
How much velocity does a 308 lose per inch of barrel?
308 Win factory ammunition were chronographed at each barrel length. READ RifleShooter.com . 308 Win Barrel Cut-Down Test Article. Summary of Findings: The average velocity loss per inch, for all four ammo types combined, was 22.7 FPS.
What is the optimal barrel length for 556?
Basically, going any longer than 16” gives a negligible increase in bullet velocity, and a longer barrel is only needed if you’re trying to max out the potential distance of the 5.56 or . 223 cartridge.
What is a good velocity for 308?
308 Ballistics Chart
| Ammo | Velocity (Feet per Second) | |
|---|---|---|
| Barrel Length | Muzzle | |
| Federal MatchKing – 168 Gr. HPBT | 24 | 2650 |
| PMC – 147 Gr. FMJBT | 24 | 2780 |
| Remington – 168 Gr. MatchKing BTHP | 24 | 2680 |
What barrel length is most accurate?
The best barrel length for accuracy ranges between 16 and 21 inches (40.64 and 53.34 cm). Shorter barrels tend to vibrate convulsively, producing a more consistent and accurate rate of fire. Notably, the energy from each shot is absorbed into the barrel in less time, increasing the accuracy level.
What is the best twist for 308?
308 Win. is most commonly barreled with a 1:12 twist. This is probably because use of long, heavy bullets was not envisioned in shorter actions. However, in . 30 caliber, even a 1:12 twist is versatile and can usually stabilize 190-grain match bullets and 200-grain hunting bullets.
What’s the best barrel length for 308?
The best barrel length for a . 308 rifle is in the 24-27 inch (60.96-68.58 cm) range. The longer barrels are usually favored by shooters looking for slightly higher muzzle velocities that offer reasonable accuracy at greater distances.
What velocity does 556 fragment?
5.56×45mm NATO
| Bullet mass/type | Velocity | Energy |
|---|---|---|
| 3.56 g (55 gr) XM193 FMJBT | 993 m/s (3,260 ft/s) | 1,755 J (1,294 ft⋅lbf) |
| 4 g (62 gr) SS109 FMJBT | 948 m/s (3,110 ft/s) | 1,797 J (1,325 ft⋅lbf) |
| 4 g (62 gr) M855A1 FMJBT | 961 m/s (3,150 ft/s) | 1,859 J (1,371 ft⋅lbf) |
| 4.1 g (63 gr) DM11 FMJBT | 856 m/s (2,810 ft/s) | 1,796 J (1,325 ft⋅lbf) |
What is the most accurate AR-15 barrel?
AR-10 16” Carbon Fiber Barrel with 2” Gas Seat Its carbon fiber design means that you get better accuracy and durability than you would with a 4150 or 4140 steel barrel, and the match-grade 416R stainless steel barrel lining ensures that precision and accuracy is delivered with every shot.
What’s the barrel length of a 223 Remington?
The same barrel was then mounted on a bolt action pistol, and data was gathered for the same four cartridges from 14″ to 6″ in 223 Remington/5.56mm NATO Barrel length versus Velocity- Short Barrels- 6 to 14 inches. The rifle used to record data from 26 to 16.5 inches (above). The bolt action pistol with a 5″ barrel (above).
What’s the maximum point blank on a 308 Winchester?
Since the 308 Winchester is 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.
What’s the barrel length of a 5.56mm NATO?
In this photo, the barrel has been shortened to eight inches. There has been a cultural shift from the 20-inch barrel length in the AR-15/M16 weapon systems chambered for the 5.56×45 NATO cartridge to progressively shorter barrels for the purpose of producing an increasingly more compact assault/entry weapon without resorting to a bull-pup design.
How does barrel length affect the velocity of a bullet?
The Experiment One of the first things I discovered is that a 26-inch barrel is too long for the .223/5.56. Shortening the barrel increased velocity in some instances. This should not come as a surprise. As the bullet moves down the bore, the pressure decreases. However, friction remains a constant.