300 AAC BLACKOUT

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. Learn a lot more about what 300 BLK can do in our 300 Blackout Ballistics Guide.

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 Barnaul 145gr. FMJ Ammo 20rds – 300 AAC Blackout Barnaul 145gr. FMJ Ammo
    $25.45
    $1.27/ppr

    120 In Stock

  2. 20rds – 300 AAC Blackout Wolf 145gr. FMJ Ammo 20rds – 300 AAC Blackout Wolf 145gr. FMJ Ammo

    ☆☆☆☆☆ 6 Review(s)

    $25.55
    $1.28/ppr
    • Buy 5 for $24.55 each

    149 In Stock

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Recent 300 AAC BLACKOUT Reviews

  • ☆☆☆☆☆
    These are the only rounds that will feed through my 300 blackout with standard 5.56 magazines
    Chris on 20rds – 300 AAC Blackout Wolf 145gr. FMJ Ammo
  • ☆☆☆☆☆
    This is excellent ammo! Shoots level and no feeding issues; it’s Black hills OTM 125g not much more to say about that. The prices are fair even though we are in a pandemic. The customer service at Ammunition To Go is top notch. There was an issues with my information, so they called me to make sure everything was correct. Some customers would’ve been irritated by that but I wasn’t; I chalked it up to them taking care of the customer and doing business the old school way which is how things should be done... I am buying more right after I type this review.
    Joseph Puentes on 20rds – 300 AAC Blackout Black Hills 125gr. OTM Ammo
  • ☆☆☆☆☆
    Super fast shipping and reasonable prices
    Wes Grindstaff on 20rds – 300 AAC Blackout Wolf 145gr. FMJ Ammo
  • ☆☆☆☆☆
    The Black hills 125gr. .300 Blk.is an accurate round. I can't wait until this ammo log jam lets up!
    John Morgan Jr. on 20rds – 300 AAC Blackout Black Hills 125gr. OTM Ammo