Sierra Bullets 300 AAC Blackout Load Data

Sierra Bullets

Test Specifications/Components

Firearm Used: Universal Receiver

Barrel Length: 16″

Twist: 1-8’’

Case: Hornady

Trim-to Length: 1.363″

Primer: Winchester WSR


The 300 AAC Blackout (300 BLK, or 7.62x35mm) was created by Advanced Armament Corp. and Remington in order to provide the military with a way to shoot .30 caliber bullets from the M4 platform with only a barrel change. It has since become popular for a wide range of uses including hunting and home defense.

The cartridge shares case-head dimensions and body taper with the .223 Remington. Not only does this allow for compatibility with existing magazines and bolts, but it allows reloaders to form their own brass from cut-down 5.56mm or .223 cases – ensuring brass supply even in the event of a shortage of factory brass.

The 300 AAC Blackout is a similar concept to previous wildcats, such as the 30-221 and 300 Fireball, as well as…

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