Period correct '74 Sharps Buffalo Rifles?

[Gunner500]

Have it narrowed down to three at this point:

45-110
44-90 SBN
44-77 SBN

The 40-90 SBN was passed on by my figuring the 16 twist with 90 grains of powder may be heck for fouling, plus as a game hunting rifle first and foremost, with the potential for really heavy game, I've read, been told, have seen, and have heard in conversation, nothing puts big game down better than the 44's and 45 caliber Sharps rifles.

Brass availability, along with "proper head stamped brass" for hunting Africa is a must, I can surely get by here from forming cases, when I head over next year for a big plains game hunt, I'll have to have properly marked cases.