off shoot question-- I recently got a teslong and I noticed a trend in a few riles--- the patches come out clean when using copper cleaner (foaming) but when I use the teslong to view the inside I see light copper build up in the center 2-4" of the barrel yet the chamber end and muzzle ends are clean an free of copper -- what is going on here? any ideas? its noit in all my barrels but it is in several and it makes me wonder what trend I am seeing.
Maybe it could be a layer of hard carbon covering the copper and not allowing the copper solvent to get to it. Or try a different copper solvent because some seem to work better on certain bullet copper alloys versus others.
I have no idea. I'm just speculating