Period correct '74 Sharps Buffalo Rifles?

[Gunner500]

Great morning, finished correlating my semi buckhorn ladder sight out to 500 yards, the 477gr paper patch at 16 to 1 alloy went 1382 fps over 77grs OE FFG, 1, 150, 2, 3, 4, and 500 yards are all GTG, what a sweet shooting and accurate rifle, it'll be my main hunting rifle this fall and winter.

Will go back later and get my 250, 350 and 450 yard marks, I have a friend that thinks the 44-77 SBN runs out of power at 400 yards, I think he picked the wrong week to stop huffing paint ; ]