Its a .50 with a 24" bullet shooty pipe thing, 1:28 twist. As near as I can figure it must be about 1400. I had been trying to calculate long range trajectory (by muzzle loader standards). For its similar BC, I used .45 ACP 230gr Ball @ 1400fps data from Hogdens manual. This got me on 30" paper at that distance, and I corrected from there. I can sightbon +2.5" at 100, be on to 150, and hold 18" over a deers back at 200. The load gives me a 7" group at that range, making it maximum yardage.
Sorry for the delay.