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If I am mistaken, please correct me, but I think 300Whisper works fine in a 300BLK but not the other way around. BLK can handle higher pressure than Whisper, so whisper ammo in a BLK is no problem; but BLK ammo in a Whisper might be dangerous.
For not much $$, you can have your Whisper barrels reamed to BLK, it's what I did and it worked out very well.
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