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You might want to try the "old timers" method and that being hot soapy water with a copper brush(stainless brush a NO NO) and give it a good scrubbing. Follow up with a tight fitting patch covered w/ Bon Ami Powder for several strokes and then wash it out w/ hot water and then dry and wet patch w/ a good gun oil and let it sit for a day. Clean out the oil and shoot it and see if there is any improvement. The Bon Ami is a mild abrasive and will help polish out the pits,erosion,etc. you apparently have in the barrel. What have you got to loose??
Just a suggestion.
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