When I got my first Blackhawk (in .357mag, circa 1980), my bro & I ran a box & a half of Winchester plated bullets through it (without ear protection, but that's another story). The bullets' plating was much like that found on "copper" .22LR. I soaked & scrubbed that barrel for DAYS on end, thought I'd NEVER get the fouling out of it, darn near gave it up for lost. After probably 50 vigorous scrubdowns, I finally got it all out. The other half box of ammo went in the canal.
When Banjos are outlawed, only Outlaws will have Banjos
The Bible is my lawbook. I turn the other cheek when applicable, and spend the rest of my days resisting evil at every front, until I have breathed my last breath.