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If you're having trouble with metal fouling in a particular rifle and tend to shoot a large number of rounds at a shooting session with it then a formal break-in might show you benefits in that gun. There are other solutions that will work as well and that would probably be faster and easier, but that's one way to do it.
If you're not having metal fouling issues then it's a total non-issue in my opinion.
If you're still worried then just clean the barrel thoroughly--removing ALL metal fouling--after each shooting session and you'll achieve exactly the same result, albeit more slowly.
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