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i was at harbor freight yesterday and an old man was in front of me buying the big rock tumbler. he said he reloads.....like about half of everyone at harbor freight these days. do those cheap rock tumblers actually work for SS tumble? not trying to derail, just didn't want to start another thread for such a small question.]
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The only tumblers I have seen at HF are a single 3lb drum and a double 3lb drum. Certainly good enough for small batches of brass if (IF) you take the "roundness" out of the inside of the drum. The brass and pins will simply slide down the walls on the smooth sided drums. So, if I were attempting to use the HF drums, I would grind some slots in the interior walls of the drum with a dremel, or put some fat beads of glue with a hotmelt gun... anything to get stuff churning properly.
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Axis: I don't think your brass is retarnishing after 2 hours. I suspect it is so clean that the SS pins are starting to burnish the surface (some lots of brass seem more susceptible to ease of burnishing; also seems more prevalent with lighter weight brass such as 9mm and .380, .223s don't do it). The 'color' or tarnish appearance is sort of an optical illusion.
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Maybe. Seems reasonable. But regardless of why, the result is discolored brass when you run it too long. Also, I have never had to be so careful about getting the brass/pin/water/shine ratio measured perfect. I hope that reducing your water volume does the trick for ya.