I clean mine after every outing. This is primarily due that I left it in a plastic case (previous storage before my safe), got called into work, and tossed it under my bed in a rush to leave on time. I promptly forgot about it, and next spring when I pulled it out wanting to go plinking... RUST BLEMISHES AND SPOTS. >
(Some minor blemishes still exist. :'()
After that, I began a more intense cleaning session, unless I actively new I was going shooting within a day or two for a planned outing.
Having said that, I don't recall the accuracy going down with the some of the really dirty Winchester stuff sold at Wally World. CCI wasn't always the most reliable shooting stuff, but that VMax and TNT stuff were dy-no-mite! (Pardon the pun. :D)
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