Old boy that passed away left me some 223 rounds that had been fireformed, then bumped 2thou in a Howa. I have a Savage- these rounds would not chamber. Two different rifles, you not comparing apples with apples. My solution although some would say it's risky is --I have a redding body die, it doesn't touch the neck & shell holder is nowhere involved with pressure on the primer, so gently bumped the shoulder on a loaded case. Easy fix for if the shoulder is the problem.