My grade 2 10ga damascus bbls produce a very slight buzz when rung, and it's not the extractor. Dale Edmonds could find no reason for it during the refinish process and reckoned they were ok. I've shot them at waterfowl (and the ****cicle - "carry enough gun," as they say) quite a lot with low pressure loads and they seems fine so far. I think you can get false positives and negatives with the ringing test, but I certainly don't write the method off in evaluating a gun. It's just one more potentially valuable tool to use in the process.
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