Hobie, I felt it was just exactly the same as what I could expect with black powder. CoW shows an original BP load with the 210gr bullet at 1562 FPS(unknown barrel length), my 35.5gr pyrodex(50gr measure), 245gr bullet was running 1320fps(15' in front of the muzzle, 26" barrel). Considering the different firearms, the 35gr heavier bullet, less volume of the converted 45-70 case, and method of cronographing, I felt that was right in line with what I should be getting. I later tapped the case to get more powder in, used a little more compression and got 37.0gr in the case but I never cronoed that load
. I did shoot that load quite a bit, it gave excellent accuracy and was easy to clean up.