Originally Posted by
Todd N.
If you want .45 Colt loads- no matter what power level- use .45 Colt brass. If you are going to use .454 Casull brass, use .454 Casull loads. Trying to put the load for one cartridge in brass of a different cartridge is just looking for a catastrophic failure. Load density, pressure profiles and more change when you do this, and it rarely turns out good.
If you are looking for light loads for your .454, use light .454 loads, or shoot .45 Colt ammo in your guns.