My '58 will hold 35 grains of powder, a wonder-wad and a ball. The '60 Army about the same. The 3rd Model Dragoon will hold 45 grains of powder, the wonder-wad and the ball and have some room left over that you could fill with additional powder (2-5 grains). The Walker loading of 52 grains and a wad & ball still leaves a lot of room if you compress the load really good like I do. Probably could get about 5 or more grains into the top of the chamber if I compressed the load prior to loading the ball in each chamber mouth.
I'd be interested in knowing exactly how many grains of powder were in each gun and then looking at how compressed the loads in each revolver were. To have only a 100 FPS difference between the '60 Army (or the '58 Remmy) and a Dragoon just doesn't seem right to me. My 3rd Model Dragoon has already been clocked at 1100 FPS with a Chrono :wink: .
In any case the swinging knock-down steel target's travel distance is a better judge of the force of the round's impact than any theory, calculator, math problem or Chrono.
Even so, you've already figured-out an additional 60-70 foot-pounds of energy with the Dragoon. That might be enough to make the steel swing enough to go almost full cycle.
Have a good one tomorrow!
Dave