Re: Baffled ???
I'm far from an expert, but just for comparison sake, have you tried seating your primers with a hand priming tool, & comparing the two methods?
I kinda lean towards the theory mentioned earlier about a certain amount if "crush fit" possibly being involved in the actual seating. I know it's strictly theory, & no one is advocating, or implying to use excessive force of any kind while seating primers, but it makes sense if you think about it for a while.
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