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I use ground walnut shell and Zud, but you can use Bon Ami or Comet. How much depends upon how dirty the brass, how many cases and etc. I have two tumblers by accident not design. You can skip the media separator if you are even more of a tightwad than I am, but it is convenient and helps get the dust out. One tumbler is about 11 years old. The media I used for this session is about 3 years old. I bought it when I finally used up my old batch that lasted around 10 years. I buy 12 to 18 pounds at a time and add a little to what is in the tumbler from time to time. This can of Zud is around 3 years old also. I tumble anywhere from 100 to 500 cases a week depending upon the time of year. I don't do more than 100 at a time. This batch was 50 from a direct gas impingement AR, which I tumbled for 2-1/2 hours.
BTW, this can be pretty dusty so you might want to do it int he barn.................
BTW, this can be pretty dusty so you might want to do it int he barn.................
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