Lets face it, the risk of burst is greater simply because a domestic vintage damascus piece is almost ceratinly going to be a weapon over a hundred years old. If shot in the past by the "village idiot" with "nitro mags" the risk of metal fatigue is considerable!
Gee, do you really think most of those really OLD domestic doubles are worth sending over to a smith who is going to "prep" them for submission to Euro proofhof?