Forget the tumbling. Go for a ultrasonic cleaner. I hardly use my tumbler anymore since I bought a ultrasonic cleaner. I use universal decappers and then clean them. They come out primer pockets clean, inside clean and outside almost like the do in a tumbler and in a tenth of the time. I bought a used 2.5 ltr ultrasonic cleaner off ebay and use Hornady additive. One cap per tank of water. You wouldn't believe how new the shells look.
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