I know a guy who has his FFL to load and sell reloads, he uses a cement mixer and SS pins to do large quantities, and I mean large quantities. He can do a 55 gal drum of brass in nothing flat. After he had told me about his maxi sized tumbler, I just had to ask him about the massive clean up that follows. He just smiled, and said his hired help does all the dirty work, can you imagine?
But his converted cement mixer got me thinking about better methods to tumble. I'm thinking something like an extra large hamster wheel with a sealed chamber for the brass and media, and maybe a hundred or so hamsters spinning it?
GS