i am working on an older savage with a lightweight barrel-- in 7mm mag.
Don't know it's history. when I look into the muzzle with a lite aiming crossways--- I can see a white looking residue that looks like its in the grooves. Looks all most like leading--- but I don't see how that could be.
I have cleaned it with regular hoppe's and then wit Iosso non imbeding paste. That seemed to help- but I can still see some. Did not see any green residue on my patches. I have heard of people using CLR or lime away for attacking difficult copper deposits. Though some people think it is not safe to use. (it's some kind of acidic mixture)
I kind of don't want there to be much fowling in there which could raise pressures. No way to know how many rounds through this gun or what kind they were----
Suggestions ?