Thread: Split shoulders

Greetings Magnetite,
I had some Federal cases crack just like that. The cases were range pick up, I think once fired. About half the cases cracked just like that first time which is unusual as my experience cracks usually develop in the middle of the neck. The survivors were neck annealed with a candle and have and have given no more trouble neck sized in the same chamber. The cases were in one spot on the range and I assume they came from the same rifle. I wondered if they had been fired in a military semi auto which often have different chambers but really don't know. There was no sign of corrosion.
Regards Grandpamac.