I am an old re-loader who is careful and slow but my son is the new "gotta go now" generation and he has run into a brass thickness problem: after using Reading dies and my "guestimate" of 5-6 re loadings, his case necks are thickening on the inside hanging up on the dry lubed, mica ) expander ball. Any ideas as to cause and cure beyond reaming the id? Many thanks, Overbore