I have a twelve bore Damascus GH on a 1-frame with .019" wall thickness in the right barrel and have shot it quite a lot but I'm not going to tell anyone who has similar wall thickness that their barrels are perfectly safe so I posted .025" as a generally-accepted wall thickness.
Wall thickness at the muzzle, which was the question that Dave began this thread with, is in my opinion not much of a concern. Farther back from the muzzle is where we should be concerned. Sure, there are a lot of guns with wall thickness of less than .025" that we shoot all the time but we should keep in mind that a significant number of people who read this forum might get the wrong idea and try shooting an unsafe gun.
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