No offense taken.....I'm still trying to soak up as much information I can. I spoke to the owner of the gun shop that Drew suggested. His gun smith has worked for him for over 30yrs and was trained in liege!! He didn't think it was neccessary to send him my gun. He felt that any smith could measuure the barrel thickness. Frankly he said, if your only going to put low load black powder through it, barrel thickness will most likely not be an issue. If the wall thickness is between 25 and 36 thousands. But also said that every time the gun is fired to visually look for rippling and bulgeing. He said damascus got a bad name from the turn of the century cheap guns.
First fire will most likely be in a vise with a long string attached to the trigger!
