I tried stainless steel but all it did was turn the cases dirty gray, but what kind of machine did you use?Personal preference imo. Stainless media in a wet/rock will get the cleanest but I prefer the dry with corn cob or walnut media.
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No cleaning/polishing agent was used. Do you have a suggestion. The gray crap won't rub off!Did you use any cleaning agent? That's far from the results I've seen.
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PIN TUMBLER is the only way to go.
Pin tumbler with half a .45 case of Lemi Shine & few drops of Dawn work well.
Depending on the size of your tumbler you may need to adjust the recipe of lemi shine & dawn ratio.
Ford
And this for really nasty brass