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see this is why i read every reloading manuel cover to cover more than once.in 50th sierra anniversary edition rifle manuel on page 22 of the ballistic service section it states this as one of the common questions sierra technitions get- Q:i have tarnished ammo.can i just put it in my tumbler to clean it up? A: no aside from the possibility of a sharply pointed bullet striking a primer and causing a detonation,the deterent coating may be altered which speeds the burning rate.most tumblers would require the ammo to be tumbled for quite some time before it was thoroughly cleaned,possibly long enough to cause some break down of the powder or its deterrent coating.the simple answer here is no,don't do it.sierra rifle manuel 4th ed. i just did'nt want you to think i was spitting out old info from grandpa or making stuff up.maybe some powders act different so they have to put that down as a general rule.i have'nt tried to find out.