The .300 AAC Blackout (designated as the 300 BLK by the SAAMI and 300 AAC Blackout by the C.I.P.), also known as 7.62×35mm is an intermediate cartridge developed in the United States by Advanced Armament Corporation (AAC) for use in the M4 carbine. Its purpose is to achieve ballistics similar to the 7.62×39mm cartridge, or even more similarly, the 7.92×33mm Kurz cartridge in an AR-15 while using standard AR-15 magazines at their normal capacities. 300 BLK ammunition cannot be used in a rifle chambered for 7.62×40mm Wilson Tactical.

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    300 blackout 220 grain Berry’s with CFE Black

    For starters, I am new at reloading. I have done a ton of research on subsonic load data. Which powders are best. Which primers, etc. I ended up starting a load using Berry’s 220 grain with CFE BLK and CCI #400 SRP. Here’s my question plus explanation for the group (and it might be long...
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