Back when I shot wax lubed cast bullets, my cleaning procedure was always just a few passes of a copper brush wrapped with part of a copper Chore-Boy pad. After that I figured out how much nicer paper patched bullets were in rifle loads, and then moved on to powder coating for the same. With either of those, powder fouling is all the barrel ever has, so my cleaning procedure is just one oiled patch followed by a clean patch if it's a chrome-moly barrel. If it's a stainless barrel, I just put it back in the safe.
