A word of advice about Tufnut:  I used to use it in a tumbler polisher... and found that it left a permanent reddish discoloration on my RP brass that remains to this day, and I stopped using it 8 years ago!  I purchased a Cabela's branded vibratory cleaner and I use a mixture of the Cabelas corncob and the Lyman's corncob.  Works great!!!  I do have to sometimes poke a piece of media out of the flash hole, but that doesn't bother me that much.