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Based on the 6 bbls I've been testing (4 300AAC and 2 300 Whisper chambered) the Whisper chamber is more accurate with supersonic loads because the BLACKOUT has a much larger and longer throat area to accomodate more fouling build-up from suppressed firing. I can see no obvious difference in pressure signs between the two chambers. Ammo loaded using Redding 300/221 dies and Forester 300 BLACKOUT dies both work just fine in either chamber.
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