I've got the same setup and the same results using 1lb stainless media, dash of Dawn, dash of Lemishine, and top with tap hot water in each drum. Let it run about an hour then hand clean.
I used to let them dry on paper towels. My latest batch was baking in oven for 40 minutes at 175F.
Each drum fits 100 pistol rounds(45) or 50 rifle rounds(6.8).
Probably spent more on the media than the tumbler.
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