It always seemed risky to me that some of the other RSOs at the GSSF matches would happily pick up any loaded cartridge they found. My policy always was, unless I loaded it, or I know it's factory, I don't want it. I don't know how it was loaded, if it's safe to shoot, etc. It finally occurred to me recently, these loaded cartridges I've been ignoring are free primed brass. I've started bringing them home, pulling them apart in the impact bullet puller, and then dumping the powder into my bottle of "junk/mixed smokeless" that I keep in one of the bench drawers. My pistol loads are all pretty mild, so I figure worst case, I might get a piece with a magnum primer and it'll make little or no difference, though I think that's pretty unlikely anyway.