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The headspace is measured from the bolt face to a certain diameter on the shoulder and the headspace of 300 AAC BLACKOUT is the same as 221 Fireball, and the same as the CIP 300 Whisper(TM) standard (within 1/100 of 1 mm or so).
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R&D for AAC
Last edited by rsilvers; 12-21-2010 at 09:43 PM.
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