Over the years,I have tried several copper removal solutions.I started off with Hoppy's no.9 and then found sweets 7.62 to be better at copper removal but it was to much of a mess.Then I went to Shooter's choice copper remover and stayed with that for years and thought that was pretty good stuff and it is,but then I tried Butch's bore shine and found it to be better yet,and quicker,the only trouble is,I can run patches through the bore for a half hour and a blue patch still comes out,Lately,I've tried the Outer's foaming bore cleaner,leave it in the bore for a half hour,wipe it clean,follow with a couple patches of Butch's bore shine and presto,super clean bore with the least effort and work.I'm thinking that I may have found the right combination,after which,I coat the bore with Shooter's choice FP-10 bore lubricant . While going through a barrel break-in routine,I leave a light coat of FP-10 in the bore for a shot to help burnish the bore.Makes you wonder how our grandpappy's ever got by when all they ever had was plain old Hoppy's or Outer's solvent,least they had more time shooting then cleaning.lol