I use Sweets 7.62 to remove copper. Another product that works great to remove carbon and lead fouling in a revolver is Outers Lead Removing cloth. Cut into patch size and use on a cleaning rod to make the bore shine. It is also the best way to remove the tell tale carbon rings that form on the face of your revolvers cylinder and the associated buildup on the forcing cone and crane.
Guns Have Only Two Enemies-Rust and Politicians
"The United States Constitution (c) 1791 - All Rights Reserved"
If Guns Kill, Do Pencils Mis-spell Words?
Pain is Weakness Leaving the Body - USMC
"Qui desiderat pacem, praeparet bellum"