What is the ballistic coefficient of 300 Blackout?
Supersonic ammunition muzzle velocities and muzzle energies by barrel length:
| Round | Weight | Ballistic coefficient |
|---|---|---|
| 7.62×39mm | 123 gr (8.0 g) | 0.280 |
| 300 BLK | 115 gr (7.5 g) | 0300 |
| 300 BLK | 125 gr (8.1 g) | 0320 |
What is the optimal barrel length for 300 Blackout?
A 9″ barrel is the optimal barrel length for 300 Blackout.
What is the best twist for 300 blackout?
A 1:7 or 1:8 twist rate works best with . 300 BLK. If you’ll be shooting mostly supersonic loads with lighter projectiles (80 to 125 grains), opt for a barrel with a 1:7 twist rate. Because subsonic loads are made with heavier projectiles (usually 225 grains or more), you may be better served by a 1:8 twist rate.
Does the military use 300 Blackout?
In December 2016 the NL-MARSOF acquired 195 integrally suppressed SIG MCX carbines fitted with a new folding stock developed for use with ballistic visor helmets chambered in . 300 AAC Blackout becoming the first publicly known military user of the cartridge.
What is the best twist for 300 Blackout?
Is 10.5 a good length for 300 Blackout?
300 Blackout sit within the 25-50 feet per second per barrel velocity rule that governs most firearms. For example, with a 10.5-inch barrel, the . For long-range targets, barrel lengths of up to 16 inches are available.
Predicting the trajectory of subsonic 300 Blackout bullets is difficult, as the ballistics coefficient can vary from 0.65 (very good) to 0.173 (dog doo doo).
What’s the weight of a 300 Blackout Bullet?
The 300 Blackout’s .30 caliber bullet can be made especially long, and as the result may weigh up to 220 grains — quadruple the weight of the typical 223 Rem round’s. So heavy a bullet conveys a subsonic muzzle velocity and correspondingly softer report. Converting an AR-15 to fire 300 Blackout is as simple as swapping its barrel.
Which is better 300 Blackout or 5.56×45?
The chief difficulty in accurately firing 300 Blackout comes from learning to accommodate its pronounced bullet drop. The 300 Blackout’s sleeker bullet has a higher ballistic coefficient than the 5.56×45, but with less speed its trajectory invariably arcs more sharply.
Which is faster 300 Blackout or 223 Rem?
A supersonic 300 Blackout round with a 110 grain bullet has a muzzle velocity approximately 1,000 fps slower than that of a 223 Rem, giving it a significantly faster bullet drop.