A useable pair? That makes me kind of nervous.
We used to run duels exactly like that, but with modern handguns. We always used plastic jugs full of water or clay pigeons because it was easier to identify who hit first with a reactive target. You wouldn't believe the amount of stress involved when two people are each trying to be first to break a target. If it was too close to call, both of them lost.I always thought it would be kinda fun to do a "duel" by having each person stand side-by-side, fire at side-by-side targets. Either they start with their backs to the targets, pistols in the classic muzzle-up position, and then turn and fire on command; or they leave their pistols on the table with their backs turned, then turn, pick them up, and fire on command. First shot on target wins.