If you are going for all of the velocity possible then the "slow" powders like 2400, H110 and AA#9 remain the way to get there even in a snubby.... but they are fiercely loud and may set the drapes on fire. I have become extremely fond of 800X for my Magnum pistol loads. 800x will tread hard on the heals of the slower powders in maximum loads. If you , like me, choose to NOT go for the last scrap of velocity in .44 magnums or .357 snubbies but rather want a"mild" magnum that spits a heavy bullet out of a short barrel at 1100 or so fps you will find that 800x can achieve those velocities with less powder expense and less blast than the "magnum" powders and mild pressures. Some complain about the way it meters but plus or minus a tenth of a grain won't kill ballistic uniformity in a magnum load.