Couple ideas, don't cost much. Give it a JBs bore paste, I use croil light penertating oil then fowards and backwards a jag/rag JBs then clean it out as norm. Have heard of a guy inpegnating projecties with cutting compound then firing them, reckons it took a rifle from not shooting to shoting with 2 shots. A bore scope would be handy as well. Have a good lok at the crown also.
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