Another point about the Encore v. Revolver is that you will have more flexibity about how you seat you bullets and the crimp, or lack thereof. If the barrel is not too short, you could gain velocity by seating a little longer if the throat will allow, to perhaps use a slower powder. Or more of the usual ;^)

Some powders might like the crimp for consistent ignition, but I would not be so bold as to say all would need the super mega mondo crimp that many 460 users probably use. I do know when you set up your seating/crimping die, you are probably gonna have one of those "well, this is different, do I need a crimp" moments. Have fun s'perimenting.....

Craig