I ended up with a few hunderd 308's that where just marked reloads from my uncle who has no idea where they came from or what year. So like a dumbbell I tried some.
Big no no! 3 shots and bang stuck case. Take out a different gun. Same thing in 2 shots. These where jammed in good. So after looking more closely and noticed all cases are mixed. And the stuck stuff was old mil surplus cases. These where hot loads for sure and the surplus cases should have been loaded less because the thicker walls.
I got one of those new bullet pullers and in time pulled the works. Dumped the powder, because there was no way of identifying the different powders. To be safe, I put the cases in a pail of water to kill the primers, re-sized what I wanted to keep and sorted by make, keep all the bullets ,sorted by weight. If you cannot confirm everything or do not know and trust the source. Pull all of them.
Never put your safety in another man's hands, if you don't know him or trust the source.