....Lack of....fundamental understanding of the differences....
....Thin barreled guns....rarely pass nitro proof....
Damascus type steel probably doesn't even need to be mentioned, but apparently it'll come up in court. Maybe a little caution is wise when shooting any hundred something year old gun, particularly the safe mono steel ones. I also wonder if the proof process has anything at all to do with the decisions that shooters make.
I'd wonder if other experts might join in and start calling for proof of damascus barreled guns in the US just to 'settle' the issue. Thank you Demonwolf and your fellow countrymen for commenting about the realities of proof when you brought up trying to get your Trantor patent gun back in proof. That gun will still need a responsible shooter to operate it.
I haven't followed the skeet game for a while, but I wonder if it was a thin issue that needed filler.