Manufacturers didn't come up with this "Damascus and Twist barrels are dangerous with smokeless powder" scam, until after progressive burning smokeless powders were introduced to shotgun shells with Western Cartridge Co.'s Super-X loads in the 1920s. All my Remington Arms Co. catalogues, from the years Remington Hammerless Doubles were in production, state they were guaranteed to handle all black and nitro powder factory loaded shells.
I have never seen any solid information on the presures developed by the various smokelss powders used in American shotshells from say 1890 to the early 1920s -- bulk - DuPont, E.C., Schultze, Hazard; dense - Ballistite, Shotgun Riflelite, Walsrode, Laflin & Rand Infallible, etc.
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