Reloading the 45-75

[dhw56]

I just purchaced one of the new Chaparral Arms 1876 rifles in 45-75. I have dies and new cases are on the way.
I was wondering if anyone had any advice and could recommend any smokeless powder loads for this calibre?

 

[Boomer]

According to Cartridges of the World, you should use .45/70 data.

 

[sunray]

There's one smokeless load for a 330 grain cast bullet on Reloader's Nest. GUy says he's using IMR3031 with a synthetic 'puff' filler.
And one on Chaparral's site using IMR4198 and a 330 grain cast RN.
http://www.chaparralarms.com/specs/calibers.htm