rdimedio
Gold $$ Contributor
Hey there - Go to our site www.us-products.com we are the originator of Gold Medallion and we have a bore paste for heavy use/black powder or a bore slurry which is what was made originally.I used to swear by it (or the old version Gold Medallion). Montana Extreme Copper Cream is a similar but slightly less abrasive cleaner which works nicely too.
Now I mostly just use Patch Out which is fantastic; and KG-1 if I specifically want to work on carbon (or Mercury Power Tune) and they work just fine with no brushing...