I recently bought the Uberti 1876, and due to my own stupidity, didn't realize it was .45-75 and not .45-70. That's turning out to be an expensive mistake. I've been researched what brass can be reformed to make the loads. Now I'm finding that no one is selling dies. I tried reaching out to Uberti, only to find that they have ceased to offer the rifle in that caliber. So now I'm stuck with an expensive and useless wall ornament.
I did see one company offering brass made from 500 Alaskan, but they're asking $4.00 per case, and they're out of stock.
Anybody wanna buy a brand new 1876 Uberti? It's out of production now, so does that make it "rare"? 
ahhh I wish there werent so much salty water between us - I could relieve you of your burden (at an appropriate discount of course )
I am out of touch with prices (and reality I guess) can you not find 348 winchester brass to convert over ? That is by far the easiest route I think - need a shell holder and a full length size die (only for the initial forming operation) ---My Dies are LEE
I am a great fan of the 45/75 - its unique profile and is the most "real" of the 4 calibres offered for the 76 - well worth the extra hassle for me . 45/60 of course is the common sense choice - but I never wanted to be common and often enough lacked sense - so ....................
once you calm down some there is a lot of info on this forum that can help to get you shooting - "she'll be right mate"