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"...What damages/causes wear on your barrel..." Repeatedly shooting it. You're lighting a hot fire in it and pushing a bullet through the barrel. Both cause wear, but in most cases, you'll never wear out a barrel in your life time. Unless you're a target shooter. Moreso for the bench rest guys. Different accuracy requirements than a hunter.
One grain over max won't make much difference. However, it's not something to play with.
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