There was a big discussion about this on another board. A guy from a powder company(I think accurate) said that tumbling it wouldn't hurt the powder since they tumble the powder is huge fast tumblers for long periods anyway and that a normal brass tumbler was slow compared to the ones they use. I routinely tumble for 5-10 minutes to remove lube.
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Gun control theory - A woman raped and strangled is morally superior to a woman with a smoking gun and a dead rapist at her feet.
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