I'd have to measure a rim before and after when using a 600 to believe the rim gets reduced. I'm not saying it doesn't happen, but man I have trouble believing it does. I think more along the lines that the shell isn't dropping down into the collet properly. It could be adjusted too tight or the plunger isn't dropping down quick enough. But then it doesn't do it with other brand shells. Something isn't right. They should all resize just fine.
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Paul Harm
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