John,
I agree that safety is paramount. I must, however, respectfully disagree about tumbling live ammo.
I've never tried it in a vibratory tumbler, but I've done it many times in a rotary tumbler. I know commercial reloaders who use concrete mixers for tumbling and they tumble millions of rounds of military ball type reloads every year without incident.
I do not believe that there is any safety concern here. Just my $.02
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