cattleskinner,
I've used 2400 in my .44 mag. for a very long time now. I did experiment with H110 at one time, but moved away from it because of the excessive flash that I got from it. I haven't had any experience with the Lil' gun powder, so I can't comment on that one.
2400, while not the cleanest burning, has been the best overall propellant for me. My 5 1/2" Redhawk does not produce much of a flash with it, even with very hot handloads.
Best of luck to you, and be careful out there! :-D