Yesterday I loaded 357 Magnum in volume for my cowboy rifle. I was loading .358 lead TCBB. I rarely use mixed head stamp but this was an exception. All cases were a uniform length, checked and trimmed as necessary. All were fired and a mixture of Winchester, Starline, and PMC head stamps.
I check every round in a case gauge. A bunch didn't pass and after segregating them I realized they were all PMC head stamp with a slight bulge at the base. My guess is that the brass was soft and collapsed during seat/crimp. I pulled 73 bullets and scrapped the primed brass. I cleaned up the burrs on the bullets and reloaded them in Starline brass, and all but a few passed gauging, the remainder cured by a Lee FCD. I attribute those to bullet irregularities from being pulled. I will probably resize bullets the next time.
I check every round in a case gauge. A bunch didn't pass and after segregating them I realized they were all PMC head stamp with a slight bulge at the base. My guess is that the brass was soft and collapsed during seat/crimp. I pulled 73 bullets and scrapped the primed brass. I cleaned up the burrs on the bullets and reloaded them in Starline brass, and all but a few passed gauging, the remainder cured by a Lee FCD. I attribute those to bullet irregularities from being pulled. I will probably resize bullets the next time.