Here is some real life data on the 2 powders. I load to around 2700fps for my M1 Garand and both are very accurate powders with 1 MOA using wartime sights. Don't assume that they will work the same in your rifle and take the time to work up loads until you get the proper velocities for your rifle.

150 FMJBT - 4895 - 45g - 2717fps
150 FMJBT - 4895 - 46g - 2717fps
150 FMJBT - H4895 - 45g - 2725fps
150 FMJBT - H4895 - 46g - 2791fps (too fast for me)

__________________
Gary
SWCA 2515