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I was just looking at the Lyman Reloading Handbook, 49th edition. Brian Pierce, from Reloader and Rifle Magazines has a section in here on reloading for the 1876 replicas. There are no loads for IMR 3031, or Alliant 2400. His loads use IMR 4198, AA 5744, AA 2015, Trail Boss, Varget and Triple Seven
My own load, for a Whitney Kennedy 45-60 is 25gr of IMR 4198 with a 330gr hollowpoint. This is a very accurate load in that rifle.