Where the thin area is makes a huge difference in "go--no go". If it's near the muzzle then the thin wall is probably a non event. If it's close to the breech then you ought to reconsider shooting it. I have a 16 gauge Lefever DS with steel barrels and they measure about .024 12" ahead of the breech. I'm shooting RST's in it but must admit being a tad queasy. However, three gunsmiths of national renown separately told me not to worry about it........but I still do.
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