I'd like one in 45 Colt too. They can also be loaded +P but not like the standard BH. But a 45cal, 250 grain bullet at 1050 fps is plenty of poop.
I ordered one with the 5.5 barrel in 44sp when they were first announced. It has been one of my most accurate non-custom handguns! Every bit as accurate as one of my Bowen Customs, & a David Clemments Custom.
But I probably like my 45 Colt Lipseys Flattop in 45/45acp just a little more because of the dual cylinders & having the capability of 2 great calibers. My 45 Flattop is the stainless version & has the 5.5 barrel also.
My Buddy lucked out and found one of the Bisley Flattop .44 Specials at Cabelas. For some reason, I just can't seem to talk him out of it