IntrpidWizard
I don't have my notes right here with me but as I recall:
.44 Henry RF was around 1100 FPS ??bullet weight
.56-56 Spencer RF 920FPS with a 420 grain bullet
.56-50 Spencer RF 980 FPS with a 400 grain bullet and 1050 FPS with a 350 grain bullet
.58 RF was around 900 FPS with a 480 grain bullet
These may not be exact but they will be very close. If you need exact ballistics I would be happy to look them up and post them on Monday.
Regards, Dave