300 BLK rounds with varying loads have better ballistic coefficients and more energy out of similar length barrels. From a 9 in (230 mm) barrel, the 125 gr BLK round has the same muzzle energy as the M855 from the M4, and 5 percent more energy at 440 meters. In terms of hit probability, the Blackout has an effective range of 460 meters. However, it has the same amount of energy at 700 meters that the M855 has at 500 meters. 300 BLACKOUT AMMO round has a lower velocity and similar bullet drop and drift at shorter distances. The bullet has significant drop, drift, and energy loss at that distance.įrom a 16 in (410 mm) barrel, a 125 gr (8.1 g). From the 14.5 in (370 mm) barrel of the M4 carbine, the M855 5.56×45mm round has an effective point target range of 500 meters. The 7.62 Soviet’s cartridge taper prevented reliable feeding in AR magazines and created wear on the bolt. The 300 Blackout Ammo was designed to achieve energies similar to the 7.62×39mm Soviet in an AR-15 while using standard AR magazines at their full capacity.
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