Never used Butch's....Barnes CR10, and Sweets.

Barne's stuff winshands down for copper.

Never had a lead problem beyond a neglected.22 rimfire, and all that takes is two beers worth of a wire brush and any handy solvent......

Gas Checks, and good lubealways helped me out in that regard, regarding CF's....

Maybe the Lead Foul Out system is something to look into?

Badly leaded pistols, and probably rifles,can be cleaned out with a lead remover, basically a bronze screen thing that scrapes it out.....