When you take your gun in to the smith, be sure that he doesn't measure outside diameter and inside diameter only to get the minimum. This method will NOT tell you if the barrels are thin in strategic spots. I had a smith (that I supposed would have known that not all shotgun bores are concentric due to the striking and regulation process) measure my barrels this way. I got an OK to shoot from the smith, but did my own thickness measurements when I got the gun home and found spots where the thickness was about .013"
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“Every day I wonder how many things I am dead wrong about.”
― Jim Harrison
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