I've always used Brasso in walnut media. I add a teaspoon full every couple of runs. Been doing this for about 40 years. 1 can lasts a long time. But, I never entered any brass in a beauty contest. Functionality and longevity have always been the criteria. I've reloaded a lot of really old (1870's) and rare brass as well as the thousands of rounds run through full auto guns with no problems or complaints from onlookers.

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Randy
Provenance nerd