I need a little help. I have a Tri-Star .45-70 Sharps clone that I've always shot with black powder. The manual states it is made for black powder loads and smokeless loads should not exceed BP pressures. I want to load some .405 LFP bullets with Trail Boss powder. According to Hodgden reloading data this should give me muzzle velocities of 971 to 1007 fps at 25,600 CUP. Now I know these muzzle velocities are within the BP range but I don't think I've ever seen BP pressure measurements. I'm making the assumption that this is Ok but I'd like to know what pressure ranges BP usually operates in. Any info would be informative.