I've reloaded various handgun cartridges for years and today put together 100 rounds for my new G23 (first 40 I've owned). Using once-fired cases (Blazer brass, Berry's 155 gr, Lee dies), I had six rounds bulge on one side at the base of the seated bullet. I have always minimally expanded case mouths, but in this instance it seems that the bullets in those six rounds actually seated at a slight angle causing a bulge on one side of the case. Those rounds wouldn't fit the case gauge, but would fit the chamber. After 50 rounds, I expanded the case mouths more than I normally would to ensure that each bullet would slightly seat in the case and it seemed to take care of the problem. On the other hand it may shorten the life of the cases. To minimize risk on the firing line I pulled the 6 "problem children" to run through a full length resizer. Any thoughts? Could the problem be more related to the seating die or brass? Should I have tried something else? Any ideas on this issue would be appreciated. Happy loadin & Good shootin.