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Unless the expander ball is too low and is hitting the bottom of the case before the ram is bottomed out. Try running a case that’s been deprimed up far enough for the expander to clear the neck. Then loosen the expander, run the case the rest of the way up, then move the expander down until it bottoms out, then move it up far enough to comfortably clear the bottom of the case and tighten it down. I know this is basic stuff and you’ve most likely done this given your experience, but sometimes I miss basic things even after thirty years of loading myself and need to be reminded.
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