My Dad's .270 was "shot out". My brother was never going to use it again. I cleaned it with a proper bore solvent and it was back putting two bullets in the same hole in no time. I don't think you need to do that every time you clean it but probably an annual or bi- annual cleaning with that stuff would suffice. I'm not an expert in this whole thing- others know more than I do- this has been my experience.
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