Cris,
There is also some issues with getting rounds. Seeing .45-90 is not currently carried by any ammo company that I know of you will have to roll your own. Not that big of a problem, mind you, but brass can be a problem.
E-mail me and I'll tell my about my nightmare making up .45-110 for my Sharps. I'll save you some time, Hair-pulling, and get you on tract with your brass.
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Schmit
GySgt, USMC(Ret)
NRA Life, Lodge 1201-UOSSS
"Si vis Pacem Para Bellum"