Handloader #217 June/July2002, has probably the best article that has been written on the .45 Colt loaded for different pressure level platform guns. Get yourself a back issue from Wolffe publishing. You won't regret it. By Brian Pearce.
All data is pressure tested data too. He list loads that use 25 grains of H-110 with a 310 grain NEI Keith style of cast bullet, LPM primers (doesn't specify brand, but I know he uses a lot of Fed., and CCI) case not specified either, since all loads listed are within the pressure limits of the Blackhawk. Velocities depending on barrel length will run around 1350-1400 FPS.
John Taffin, in his books often recommends 21.5-22 grains of H-110/296 with a 300 grain bullet for use in the Blackhawk for around 1200 FPS depending again on bbl. length.
I have tried most, if not all of these loads, and while the recoil is brisk in the Blackhawk, are good and safe loads. I have used these loads in Midway, Rem., and Win. branded brass with no apparent difference in performance or pressures in both a 5.5" Blackhawk, and a 7.5" Redhawk.
THE ABOVE LISTED LOADS ARE FOR USE IN BLACKHAWK, REDHAWK, AND F/A GUNS ONLY!!