Get a dental pick. I use Pyrodex P and get a harder black fouling in the nipple recesses, which is what that varnish sounds like. I don't scrape at it. Rather, I press the tip of it into the edge of it, and it cracks loose.I have been shooting tripple seven in my pistol and rifle and its dead easy to clean the barrel but I get a really tough varnish build up around the nipple. any tricks to clean that off?
Thanks
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