I just got one of those tumblers from HF…. Loaded up about a pound and a half of .40 cal RB in each side and let’er rip for a few hours. They came out one side looking beautiful, but apparently someone had returned the tumbler after using it (looked perfect coming out of the box) and there was abrasive residue in the other canister. Balls from that side all had a coating of grit and were flat black. I figured I’d throw them in my brass tumbler to clean off that powder and ran them in that for a little while. That didn’t work out so well. Now they have a coating of polishing grit and walnut dust and an interesting red color. Gonna have to melt them down and start over.Harbor Freight, double canister, with a small piece of pencil graphite with the balls. Hope they shoot as good as they look.
Needless to say, the offending canister got a good bath.
The batch on the right are what they look like after tumbling with no media in the canister. They turn a glossy black.
The size stays the same but the sprue area smoothes out nicely.
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