My traumatic learning experience: I had problems chambering 45-90 and 45-110 rounds in two good quality Sharps replicas. This loading used lead bullets. It turned out that the case mouth remained expanded enough to jam up chambering. The down and dirty answer here on the hill was to get both long and short Lyman taper crimp dies. No more problem. Rifles shoot great. I use a Lee FCD to clean up case mouths loading 308 and 30-06.

The mistake came, with me, when chambering a sized case thinking that it would chamber as a loaded round. Sure enough it's good to eliminate problems with the sized case. I found out the hard way it's no check for case mouth problems or COL problems.