Cool to see another Spencer Buffalo Rifle....they certainly look the part...!
I have an ArmiSport Spencer military rifle in .56-50 centerfire that I've played around with some.
And while I've been able to ring a steel gong at 300 yards occasionally, I've never really had great faith in the cartridge as a big game round...
But by removing the two-pronged "steel-finger" that rests on top of the breech-block I've been able to partially insert a .50-70 Gov't round in the .56-50 chamber. So I have been toying with the idea of having the barrel re-chambered for .50-70, in order to turn the "pop-gun" into a full-grown single-shot rifle.
And if I had a Stabler Cut-Off installed I would still have seven rounds of .56-50 "on tap" in the buttstock in case the "injuns" jumped me while I was "running bufflers"....!
(Come to think of it I DO have a .50-cal. barrel blank lying around....and a fore-end sized piece of hardwood....and my local gunsmith does have a .50-70 reamer....Hmm...; winter project...?)