I tumble rifle brass twice. The first time to clean it up before sizing. The second time to clean off the case lube and brass shavings from trimming. Media does get stuck in the primer pocket but a quick look and a stab with a flash hole cleaner takes care of it. This is also a good time to inspect the case for damage.

Pistol brass gets cleaned prior to sizing and that's it. I inspect each case prior loading it into my machine.