RCBS Neck sizers bumping my shoulder a few thousandths??
What would cause my neck sizer die to push my shoulders back? A once fired case measures 2.265, a reized case measures 2.258, a twice fired case 2.261. I turned the sizer die 1/8th turn down from contacting the shell holder. I only fired one reload loaded with the starting load for my 210s. Case looks fine to me. I'm just worried I overworked those 15 peices of brass and may have a premature case head seperation.