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it was day 3 or 4, when the patches came out clean as a whistle. so i decided to slug the barrel. i did and black gunk and copper spirals and some more black gunk came out before the slug did. so i spent 3 or 4 days more!!!! i should have measured the slug but i was amazed at the “pile” of gunk i just did.
i measured the slug after i cleaned the barrel and it is .3085″. i now use .311″ 165gr ranch dog.