The .300 AAC Blackout cartridges were developed by Advanced Armament Corporation (AAC) for use in the M4 carbine to achieve ballistics similar to the 7.62x39mm supersonic cartridge, and to offer a subsonic yet powerful cartridge for the AR15 platform as an alternative to the MP5SD 9mm, all while utilizing a standard (STANAG) magazine.
A .300BLK subsonic cartridge is a heavy, lower-velocity round perfect for pairing with a suppressor. Using subsonic cartridges with a suppressor helps to eliminate the “crack” that is inherent with supersonic cartridges, reducing noise levels down to a safer volume.
Muzzle Velocity V0 ft/sec: 1,985
Muzzle Energy E0 J ft/lb: 1,268
Max Powder Pressure Bar (lb/inch2): 50,763
Cartridge Max Length: 2.15 inches
Rounds per Box: 20