a couple things I gleened from STM's site... they don't recommend round drums they like the drums with the flats ( I'd guess more adgitation, so it would work faster??? )
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DO NOT buy the MJR Tumbler, you need a hexagon shaped drum.
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& ...
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Q. Will the media harm my brass?
A. No, the media will not harm your brass. It does not work harden, or damage your brass in anyway. We have a new piece of brass that has over 4000 tumbles on it with no measurably amount of weight lost.
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