When I got this, it shot a foot high or more at 25 yards and was a bit tight for proper functioning. I relieved the cap channel in the standing breach,radiused it a bit and got it working. Also filed off quite a bit of the hammer nose/rear sight and cut the notch on the bias to line things up horizontally.
Now, it shoots just a few inches high at 30- 50 feet and is close enough to be death on a rabbit at the shorter range. The velocities with fffg and pyrodex are right at 700 fps and even at this puny level, it will put a 31 cal 50 grain ball through three gallon water jugs.
Now that it shoots close to the sights, its an unalloyed pleasure.