Re: copper killer ?? ??? ??
I use it on my rifles (.243/7Mag/.300WM) and it doesn't hurt them. I do not leave it in the barrel for any length of time though. It is strong stuff. Do not take a big whiff of it - it will take your breathe away.
After using it on my 700P (chrome moly) barrel and I know I'm not gonna shoot it for a few days, I run a saturated oil patch (Kroil/Marvels Mystery oil) through it and then dry patch that out. I usually clean just prior to shooting.
I have been using Copper Killer for about 2 yrs now and have noticied no decline in barrel life or accuracy. It will get the copper out.
I also use another of their products; Bore Solvent and it gets carbon and powder residue out great. After about 3 wet patches, with 1 dry patch after each of those, I don't have alot of anything in the barrel. So then when I hit it with the Copper Killer I don't see alot of copper residue on the patches. JohnnyK.