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I use Sweets after every range session in some of my copper fouling rifles, but follow it with a rather liberal application of Kroil. It really gets down in the barrel imperfections to raise other ingredients up. Maybe I've just been lucky so far. I've noticed with Kroil that when applied to what appears to be a clean barrel it will give me dark, patches with fouling on them. I guess it penetrates deeper than the other products I use, but I am leery of Sweets. Best wishes.
Cal - Montreal
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