This like-new Savage 112 'J' single shot circa '75-'78 followed me home the other day. Beautiful shape and obviously shot very little.
I knew the barrel was pretty coppered up as the copper streaks at the muzzle were pretty obvious. But little did I know how fouled it was!
After four days, the copper is finally out. I threw everything I had in the chemical cupboard at it....Butch's, some vintage Shooters Choice Copper Remover, TM bore cleaner, Wipe Out, household ammonia, Kroil, a 50/50 mix of ATF and acetone (which works really good, by the way ) and a couple more I won't mention in case my town's Hazardous Materials Response Unit should get wind of it.
In the end, it boiled down to simple elbow grease and brushing/patching...followed by aggressive use of JB... followed by more brushing and patching...followed by over night soaking with Hoppe's Black Powder Gel. Then repeat the process. As it progressed, you could see that it was layers of powder fouling over copper, then more powder and copper, etc. Once down to bare metal, I finished it up with a final round of JB on a new bronze brush working over the first 5-6" ahead of the chamber with 10-12 strokes for each full stroke down the barrel. After the final JB'ing and cleaning, the throat feels really smooth with a patch. I might take a peek with a bore scope. Or not. Don't know how many patches I used but the process killed 6 new phosphor bronze brushes. The dead brushes got recycled to JB victim duty.
Most guns from this era didn't have the barrels shot out as much as simply ineffectively cleaned. I've resurrected several others that were in the same shape.
Good shootin'.
-Al