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Old May 15, 2012, 05:34 PM   #3
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Join Date: February 13, 2006
Location: Washington state
Posts: 13,004
Powder fouling and lube residue that has varnished, from the sounds of it. If it really needs to come out, try a solvent like Hoppe's. And it is a good idea to not scratch at the bore with anything metallic, rifling is only about .002" deep on a 22 rimfire and old rimfire barrel steel is very soft.
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