Frank don't know what that may be, but I swear by "Butch's Bore Shine" works great to remove copper fouling, may help you out here also.
I told a friend about it that had a one hole Savage .223 that his MOA went bad and he tried all different solvents and nothing worked until he tried this. Now he is back to shooting 1 hole groups now.
Also where have you been getting the 140 and 120gr Noslers from, I can't seem to locate any?
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