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Read the link provided from hart carefully, and you will discover, it's not clear on this issue at all. Hart is saying your barrel will not give you any problems whatever that means. But that's not why people do this procedure, they do it for 2 reason. 1) They think it improves accuracy 2) They think it results in a barrel that holds less copper per given shot string.
I have no idea if it increases accuracy but if you read the next paragraph on the Hart link they actually say that you need to clean and shoot if you are retaining to much copper.
There has yet to be an actual study on this idea of barrel break in. Until then it's opinions even though some of them are expert opinion, still opinion.
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