Al, I have a Thumbler Tumbler. It is supposed to be for rock cleaning, but seems to do well with brass. I have learned to fill the tank almost full and I add dawn dish liquid and lemon shine for cleaning. A couple of hard knocks along the way: a half full tank allows the brass to beat itself up and you are dealing with liquids that you have to make sure have completely dried before loading. The process seems to shine the outside well, clean the inside very well, primer pockets, not so well. That’s my story, WWE