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The way it's been explained to me, by a barrel company, is barrel break in is a bit of a incorrect term because it's not really the barrel you're breaking in but rather the throat. They said barrel break in is largely dependent on how well/smooth it was throated and if the transition from the throat to the barrel isn't cut that well/smooth then you'll see a benefit from barrel break in but if it is done correctly there is no real need for break in.