I noticed the "fine laminated steel" in your post. Virtually all original percussion doubles are laminated steel. Some are laminated in a Damascus Steel pattern and some more simply (I recently saw a Westley Richards in simple laminated steel). What this means is that the barrels were made by welding a steel/iron ribbon around an iron rod in a helical pattern. It was possible to make the barrels much lighter in this way, and therefore a quick gun for wing-shooting.
When "smokeless powders" came in, quite a lot of laminated barrels blew up. This was not because laminated barrels are bad, but because, a. smokeless powders produce much higher pressures than BP, and folks tried out smokeless powders; b. some users didn't translate loading procedures well (which would have been hard to do). There were very nasty accidents, and laminated (or Damascus) got a very bad name.
Recently, there has been a renaissance in Damascus. Some careful research (publicized by Oscar Gaddy) has shown that Damascus is surprisingly strong, and that well preserved Damascus barrels are shootable--with reasonable care and loads. One gun that was tested spewed smoke through an open pit-hole, but they couldn't get the barrel to actually fail.
However, before considering shooting any laminated gun, it should be inspected by a gunsmith who is fully conversant with Damascus/laminated--not a common breed. Most smiths will say "If it's Damascus I advise you not to shoot it." Some will say, "My insurance company will never let my say that any Damascus gun is safe to shoot." A few will explain, "Damascus is only reasonable to shoot with so much bore pitting, so much surface damage, as so much minimal wall thicknesses at various distances from the breach. Your gun is X, Y, Z, which is unsafe (on one end) a reasonable risk (at the other end) for these reasons, or somewhere in the middle.
All these original guns are load enough to be used with considerable discression.
