My dollars worth, used to be 2 cents but with the way prices have gone up...
I loaded some (100) .44 mags, new Winchester brass with 240 grain JHPs and my mix of powder and primers. I put them away in the bottom of an ammo box in those nice red MTM plastic boxes, all labeled and ready if I ever needed them. That was in 1976 or 77. Time passes and almost a year ago I pulled those red boxes out and found that 41 out of 100 of the new cases, 35 years ago, had split!
I recovered the bullets and scrapped the brass, primers and powder. I know, the primers and powder were known items, I had loaded it all and listed it back then. I scrapped it anyway.
Some cases just don't hold up. How are we to know?
Pull the bullets and scrap the split cases. Punch the primers and anneal the others. I think this is the best course of action.
Enjoy,
OSOK