Period correct '74 Sharps Buffalo Rifles?

[Kurt]

Gunner.
That Cape is a tough thick skinned critter. At what range do you expect to shoot it? I don't think I would use that light 1.285". A 500 gr at 1.370" cast with 1/20 would be a lot better choice in my opinion for that tough Buff. That 1.370 will work just fine inside 200 yards or less then I would think you would shoot.
When you get that rifle I will send you some .500 grainers of the original Sharps profile to do your own testing. I think you will find them working just fine for a hunting bullet. Just make sure that that bullet is small enough wrapped for a quick follow up shot in a dirty throat. That .44-77 will bump ut a 1/20 bullet a long ways to fill the grooves and it will end up about .065" TO .075" shorter when the charge goes off.