Re: butch's bore shine
I don't think I've ever had a copper problem with a chrome lined barrel. In any case, Butch's has had no negative effects on my unlined barrels, so I can't imagine that it would hurt a chrome lined barrel, if used properly.
Still, I don't see the need for it with a chrome lined barrel. I clean my chrome lined barrels with Slip 2000 EWL, which is also the lube that I use.