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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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  1. LSWC

    Your preferred 300aac reload recipe

    Depending on your use I can see a lot of different load options for this caliber. Looking for some summary data from folks that may have tried a few different bullet weights & powders to find a good load that's working well for them. Supersonic & subsonic both - What led up to your preferred...
  2. J

    Build Thread  Converting AR15 300aac pistol to piston

    I wanted to use Superlative Arms conversion kit for an ar15 pistol in 300aac; but their kit doesn't support 300aac. That leaves the Adam Arms kit. Before I go that route, I was wondering if anyone tried the superlative arms and got it working on a 300aac pistol? Or is there another option...
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