Time for some gunsmithing...
The Sharps wonderful set trigger stopped working. Must be something broken. They are relatively simple devices. A spring powers a piece of metal that whacks the trigger/sear bar, sort of like a mouse trap. It feels like it is "setting" the spring may be broken. I'll know more when I get in there. I need to whack the sights to the right and get windage regulated too. The 500+ gr. bullet at 1025 fps was dropping about 6" or so at 100 yds., it looked like.
I've thought about one of those long range tang sights but honestly they are used little and get in the way. The rear has a flip up with elevator to 500 yds. anyway. The "White" muzzle loader website lists Pedersoli vernier tang sights for $100 a copy, VERY cheap if they actually have them. FYI