Here's what a Sharps M1874 will do from 1000 yards fired with aperture sights:
50 2 1/2 Group by Sharps45 2 7/8, on Flickr
This was 10 rounds fired using 120 grs. BP and 720 gr. all-lead cast bullets that I pour up. This particular alloy was 1-20 IIRC. I was testing this load for holding...