Once again, the issue is where on the barrels tubes you are measuring. FOR ME,.100" at the end of the chambers and .025" anywhere (that can be measured) along the tubes would be a prudent minimum for 100 year old small gauge barrels shooting low pressure modern loads. As Dean points out Parker made many "light" 0 frame guns where these figures be marginal even when new. Many British Damascus guns have been proven for "nitro" loads with barrel specs similar to these. I have owned and shot these with the same loads I would use in a comparable fluid steel gun. Very few Damascus barrels have survived without "cleaning", "browning" and/or dent removal. I received a PGCA letter yesterday on a #1 frame D grade toplever in 12 gauge that went back to Meriden no less than 3 times for all of these operations each of which reduced barrel wall thickness...
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