I agree with Edgar. I can't see how a crack could possibly form across all the wraps of material of such different properties as in a damascus barrel. Just doesn't sound plausible. A scratch yes, but not a crack. You should do some research on the nature of the nickel plating used on shot. Some nickel plating contains silicon-carbide or sapphire, both of which would make it more than hard enough to scratch steel.
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