I guess the biggest question is where the thin spot is, but the industry standard is .025 and most will say .020 isn't a problem if your using RST's. Use your judgment on the condition of the barrels in and out, and for some folks (but not me) the type of steel. For years I shot Remington Express loads out of a 16 ga. with .018" walls, I bought it from a member here who advertised guns for sale in a retail market place and trusted it was safe to shoot. I might not recommend doing that, but it's a good test of Titanic steel barrels.
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