I've used wheel weight metal(dull weights only, the shinny ones have zinc in em', stirr clear of those) and I've fluxed it with Borax, which is suppose to de-alloy it a bit. They work ok for general shooting. For target work pure lead is the best way to go. As long as the alloy isn't too hard, like linotype, I don't see why it wouldn't work ok for plinkin' and general shooting.