I noticed a little while back that I am getting some discrepancies in my OAL (measured at the ogive with a hornady bullet comparitor. Bryan Litz said that he had seen some OAL discrepancies due to excessive neck tension, and I think that is my problem, since I am FL resizing with no expander ball, then chamfering to avoid jacket shaving. My reasoning behind this was to avoid run-out as some people believe that expander balls pull the case neck out of alignment. So my questions is: should I just ignore that and use the expander ball, or should I just go for a mandrel setup? Thanks.