I used to use Walnut Shells with a dash of Dillon's blue liquid polish (30 years) but about 5 years ago one of my friends turned me on to the Lyman GREEN media for tumbling. It needs NO ADDITIVES and works far better than what I was using. It also lasts quite a while and I would highly recommend it. I just throw some used dryer sheets in when I am near the end of the cycle. GREAT results!
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