I'll wade in here. Stick my toe inna water as it twer. Uberti has built The Open Top chambered in 44 Colt. Marked 44 Colt. Would not chamber 44 Special. Uberti built some Open Tops marked 44 Russian. Would chamber 44 Colt, not 44 Special. Uberti has built some Open Tops clearly marked 44 Colt that would chamber anything, Special, Russian, Colt. Almost anything goes. My 44 Colt cylinders will chamber 44 Special.
I don't Care so long as I can get 44 Russian cases innum.