Hi John,
It was a repro. and did not have Blakely rifling. Not sure of what the failure was. Maybe where the e-screw was move to for the shorter barrel. If I remember right, Stuart loss a Blakely in simular manner sometime in 1863.
I was a nice shoot. Great wheather, around 30 guns and I dont know how many mortars (including a couple of 10".)
Put your Nickles away and come and play.
RCHJr.