A friend who has lots of heavy creds (state championship more than 1X, Wimbleton 1X, and Palma team armorer) did it every 3,000 rounds. I, being real frugal, sought to double this and my 600 yard scores plummeted. Sometimes the barrels got so hot it seems like your fingers would stick to them. When it was new it shot real good like 5 in one hole @ 100. Recycling serious shooting barrels for hunting might be valid but I would not need a .30 caliber barrel for that.
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