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Are you wet tumbling? If so your brass could be too clean and the expander can't slide in the case easily. So it grabs the case wall and starts to push down, by then the case is expanded so the die does the rest. I started using a car wash with wax rather than dawn soap and the issue went away. Something to think about. Try a bit of lube on the expander on a batch of cases and see if the issue goes away.