Pick a non toxic gun cleaner/carbon remover and have at it. Pick something that isn’t a copper solvent though.
But if this is something that you really want to do in volume (it is not necessary and will have nothing to do with safety) then wet tumbling in ss media is probably the best option.
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“I love it when clients bring Berger bullets. It means I get to kill the bear.”
-Billy Molls
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