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As has been mentioned, there are at least several "theories".
From what I recall of National Match Course shooting, I used to clean between 200 and 300 yard stages, when I could, and always before 600 yards. When shooting 1000 yards, always cleaned between strings.
As for "breakin" with a new rifle, or new barrel, carefully clean the bore, to get rid of any factory grease or preservative. During load development, shooting ten shot strings, I would clean when changing from one load to another. While I might have missed something somewhere, this seemed to work, at least so far as I could tell. Perhaps other ways, that have been detailed in posts and articles, are on to something. I can't really say, one way or the other.
Personally, I would pay considerable attention to any suggestions The Gunny might have to offer, though it is possible that his thinking might have been conditioned as a result of his experience with "the service rifle". Still, he might well have had a lot more exerience with rifles than most of us.
Alan
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