I would at least run the expander ball thru it.
Just a thought... I would try chamfering the inside and outside of the neck mouth before running the expander thru it or sizing the new brass. Lots of brass has buildup on the case mouth from forming the new brass. I always remove it with a chamfering tool before sizing it. Might help.
Just a thought... I would try chamfering the inside and outside of the neck mouth before running the expander thru it or sizing the new brass. Lots of brass has buildup on the case mouth from forming the new brass. I always remove it with a chamfering tool before sizing it. Might help.