The gunner500 load of 70 grains of compressed FFFg with 530-grainer would make for a good try in the .50-70 Little Bighorn.
A little extra barrel time at 1250 fps MV and a little extra muzzle lift (recoil) from the greater powder mass ejected might get it zeroed,
as long as the lesser bullet weight does not drain off too much of the recoil.
Many .50-70 possibilities with either Holy BP or sacreligious smokeless:
440-450-grainers in antique Trapdoor 1:42" twist
480-535-grainers in Pedersoli Sharps Long Range 1:26"
480-680-grainers in the Little Bighorn 1:24"
480-680-grainers in the McNelly Sharps 1:18"
One can conceive of my 777-grainer (BOL = 1.568") at 1050-fps using gas check and smokeless
in the McNelly Sharps carbine for a .50-70-777 subsonic plinker.
That requires a 1:19" twist according to this:
https://mcgowenbarrel.com/twist2/Could go down to 950 fps MV with the 777-grainer in a 1:18" twist,
But since the bullet is almost as long as the brass case,
that might require re-throating of the McNelly Sharps carbine
Grease lube with BP, and powder-coat paint with smokeless.
Save the paper patches for .40 and .45-cal.
The .50-70 Govt. was a grease-groover to start with.
I have no desire to paper patch .50-cal bullets !
