If one casts then the crimp groove can be located for the 45 Colt brass. If you followed Ross Sygfried when he was writing about handguns he routinely loaded federal 45 Colt brass to 454 levels without problems.
THIS!!
The issue isn't the brass, it's the chamber. If the chamber is cut right, a .45 Colt will do anything a .454 will do. Federal and Starline .45 Colt brass is as good as cartridge brass gets; period.
