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I never bothered to fix the donuts on my cases cause I read that trimming them off the inside doesn't really fix the problem, and the only way to really fix them is to "push" them to the outside of...

Donuts can happen for a variety of causes (none of which I understand) but they got my attention real quick when I got them on a 6.5x47 on sizing after first firing - what do you mean Mr Lapua, this...

Have you had a careful look inside the case necks, sounds to me like you might have a "donut" inside the case neck . . .