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1. Have you checked the case length and when was the last time you trimmed them?
2. I bet you have a mixed shellholder and die. Each manufacturer uses a slightly different bench height on their shellholders and if you mix brands you can run into this problem. One thing you can do is remove a little from the top of the shellholder (you should not adjust the dies). It only takes a little sanding with 400 or 600 grit paper.
3. It sounds like some of the cases are getting fire hardened and may need to be annealed.
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