300 Blackout ammo was developed by Advanced Armament Corporation and Remington Defense in 2010 and standardized by the Sporting Arms and Ammunition Manufacturers Institute (SAAMI) in 2011, the 300 AAC Blackout (also known as 300 BLK or 7.63x35mm) is a relatively young cartridge, but one that is rapidly gaining in popularity.

The 300 BLK was developed around a long list of design parameters intended to allow the use of .30 caliber projectiles in the AR/M4 platform. Chief among them, the cartridge had to feed reliably from standard 30 round magazines and utilize their full capacity, which previous attempts with the 7.62x39 cartridge (used in the AK-47) failed to do. Other requirements included the ability to operate suppressed or unsuppressed in a short, lightweight configuration.

The propellants used in 300 BLK cartridges tend to be much faster burning than typical rifle powders, meaning the 300 BLK is well suited to pistol-length gas systems and suffers relatively little in the way of velocity when fired from short barrels. This makes the 300 BLK an ideal choice for AR-style pistols or short-barreled rifles.

The cartridge uses a shortened 221 Fireball or .223 Remington case, shortened to 35mm with the new case mouth necked down to .308 caliber. Bullet weights for the 300 BLK range from 110 grain to 250grain, with lighter projectiles suited to maximum velocity while the heavier bullets are used for subsonic work and maintain high energy despite limited velocity.

Ballistically, the 300 BLK performs much like the 7.62x39mm cartridge, with a shorter effective range than 5.56x45mm NATO, but with more kinetic energy than the latter. Because of these characteristics, the 300 BLK is well suited to close range combat and for hunters wishing to use the AR platform.

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  1. 20rds – 300 AAC Blackout Wolf 145gr. FMJ Ammo 20rds – 300 AAC Blackout Wolf 145gr. FMJ Ammo

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Recent 300 AAC BLACKOUT Reviews

  • ☆☆☆☆☆
    HAD A "LONGTIME RELOADER" FRIEND "Examining" the box. Said - had heard about BLACK but never shot any cause he ... well.. reloads all his 300... SO: never bought any. "HAD" reloaded this particular HORNADY bullet, tho. Was ABSOLUTELY FREAKED OUT at the velocity of this BLACK. Said "DAMM! They pushing this load out that fast?!! WOW. would NEVER load this HOT! Thats a HOT, HOT LOAD - only HORNADY could pull off, I guess. I'd never try to load it THIS HOT!" He was impressed. When I showed him virtual hole-in-hole at 75yds... was "doubly" impressed. Said "BUY ALL YA CAN! THATs A HOT BULLET - ESPECIALLY AT THOSE VELOCITIES!!"
    KINGS_LOAD on 200rds – 300 AAC Blackout Hornady BLACK 110gr. V-MAX Ammo in Field Box
  • ☆☆☆☆☆
    Love these rounds for Florida wild boar hunting at night. Drops them quickly, and low recoil allows quick retargeting on the next hog!
    William Selosky on 20rds – 300 AAC BLACKOUT Hornady 135gr. FTX Ammo
  • ☆☆☆☆☆
    I’ve never even heard of this website until today and reluctantly am going to tell everybody even though I want them all for me but that they have absolutely the best prices hands down on subsonic 300 aac Blackout subsonic 200 grain I’ve EVER SEEN PERIOD!!!!!
    Colin Crandall on 500rds – 300 AAC Blackout Magtech Subsonic 200gr. FMJ Ammo
  • ☆☆☆☆☆
    Excellent for plinking and varmints. Coyotes, javalina, etc
    Scott Hobbs on 20rds - 300 AAC BLACKOUT Remington 220gr. OTFB Ammo