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Whenever I sell a rifle I cannabalise the remaining ammo and reuse the powder and primers. I am as thrifty as the old elephant hunter who only had one bullet, and he used to dig through the elephant...

Been there done that, don't work the best killer of primers is plain old water put a little in the case leave it a couple of days fire one in gun to see if dead if not a couple more days should do it

And ear defenders they are quite loud, It is safe to deprime live primers they need a fast hard strike with a pointed object to go off, pushing them out with a press and decaping pin is not going to...