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With a 300 AAC BLACKOUT 20 inch barrel I pushed a 110 Sierra to 2720 fps before popping a primer. I backed it down to 2550 for the rest of my loads. I have not actually pressure tested it though.
Note: 300 Whisper(R) has a shorter throat and as such you typically would not get as much velocity as with 300 AAC BLACKOUT for any given amount of chamber pressure.
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R&D for AAC
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