The fist day benching my new GM barrel, the 18" twist, I was shooting 400gr. RP FN's & had worked up to 48.0gr. Benchmark in the 1.9", .45/60 case.
Chrono'd speed was 1,850fps in the 35" bl.

Using an Italian copy of a Soule Tang Sight and globed Sharps front with aperture, I managed a 7/8", 10 shot group off the bags at 100 meters. It was absolutely amazing. Most loads with REAL black powder run from 1" to 2" at 100 meters, 5-shot groups using same sights using the afor mentioned bullets. My rifle seems to prefer the 525gr. #457125. A blow-tube is used between shots and is shot 'dirty'. I have only just started working on the BP loads.

42gr. Benchmark and 506gr. RN GasChecked Lyman bullet (478gr.?) managed several 1 1/2" groups using open Sharps Sights, V and silver blade.

These loads were safe in my Sharps with the huge, BP firing pin.

The rifle with the Carbine Rear Sight. An 1868 Italian action that I finished from the rough milled state, filed on the hammer a bit to make it look like a 74 hammer, then had the action metaloyed after polishing. Thus, the colour.