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Originally Posted by Webleymkv
As long as you're not noticing any accuracy problems, it's nothing more than a minor cosmetic flaw.
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AFAIK, the crown protects the rifling, but an even crown also insures the gases expand evenly as they (and the bullet) exit the barrel. A gash that doesn't damage the rifling may still lead to a small asymmetry in those gases, which may exert uneven pressure on the bullet. At the end of the day, though, as Webleymkv pointed out, the only way to know is to shoot it. It assumes you've got a pretty good handle on it's pre-gash accuracy, though.