.50/70 is a good one. I don't know if it's still available, but the old Accurate Arms handloading manual had smokeless data for the .50/70. Best listed was using (I think) the 450gr. Barnes (or Lyman 450 cast) and AA2015 powder, for 1,800fps+. It was impressive.
All I shot in mine, was black powder, in deference to the 1859 Sharps barrel I was using in the 1868 copied Italian cast 4140 action. That barrel was lined and turned into a .50/70 in the 1867 contract the Gvt. had with Sharps on rifle and carbine conversions to CF.
That old barrel put 5 450's into 3" at 100 meters (109yards) with 10gr. IMR3031 and 60gr. of 1F GOEX. 3 of them were inside 1 1/2". Shot dirty, no wiping- none needed with the 3031 starter.
.348 brass can also be used in that chambering, however it would be better if the chamber was sized to the .348 brass head size as in the original .50/70 chamber, there will be a lot of case web expansion for the .348 brass to blow out to fit.
I think Starline makes .50/70 brass, available at Buffalo Arms.