I have never used the shorter Casull or Colt cases in my 460. The 460 is an extremely high pressure round, higher than many centerfire rifles, most loading data showing pressures at or around 60k PSI. I never cared for the idea of stubborn fouling in the chamber throats possibly causing pressure spikes. If I want to send less horsepower downrange, I shoot a different revolver chambered in something with less horsepower.

You can use reduced 460 but use caution. Only a few powders are suitable for reduced loads in the very large 460 S&W case. Stay away from H110, W296 and similar powders if you want to make reduced rounds. I believe Western Powders has a "reduced loads" section for the 460 that utilizes powders other than what are considered "ideal" for max power out of the 460.