My tumbler is relatively small, but it will process 2000 9mm cases with the steel media per batch. Larger units will process much more than that at a time, along with more streamline methods of separating the media and drying the brass. The nice thing about this method is that I never have to wear gloves, there is no lead dust left on loaded cartridges for other people to get on their hands when they handle the ammo, and there isn't dust left over in my loading area or my dumping area.