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Old April 22, 2021, 07:57 AM   #2
Join Date: March 4, 2005
Location: Ohio
Posts: 19,281
Gas traveling back along the case from the mouth usually means the pressure wasn't high enough to expand the brass firmly against the chamber at the moment the bullet cleared the muzzle. Using a faster powder or heavier bullets or warmer loads are the usual ways of treating the issue. That said, it may well just be dirtier than other powders. I haven't tried it, but have heard others comment that the CFE powders don't burn cleanly.
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