This rear sight, the one that was on my .50/70 Carbine, is now on my .45 2.9" Sharps last picture, a slightly reworked Italian M68 Sharps (in the white) action I draw-filed, polished and had finished in a commercial "Metaloy" process.
In the 35" GM barreled Sharps,a s pictured below with this rear ladder sight and silver blade front sight, I did manage 1 1/2 inches groups for 2, 3-shot groups using smokeless powder and 505gr. Gas/checked bullets with 42.0gr. Benchmark powder, my brother on the spotting scope, spotting both groups. He was rather surprised, as was I for such rudimentary sighting. Just lucky, I guess. After the first group, he said they are a little high - aim at 6 o'cock on the bull for the next group. I did, ending up with 2, 1-1/2" groups for the 6 shots. Of course, this really doesn't mean much as they were only 3 shot group.

: top pictures - carbine barrel w/sight

Bottom picture .45 1.9" chamber with 35", GM heavy 3 1/2 taper barrel. Rifle weight 12.5 pounds.