This is from the old Dan Wesson Website:
Our .445 SuperMag outperforms the .454 Casulls in the following ways:
1. Our .445 SuperMag delivers more accuracy (none of the Casulls have the Dan Wesson system of anchoring the barrel front and rear and keeping it under constant tension to prevent barrel whip during firing);
2. Our .445 SuperMag delivers more down range energy (the same weight bullet in .44 caliber is longer and more slender that a .45 caliber, and therefore has a better ballistic coefficient, and therefore retains more energy. We don't put muzzle velocity (the testosterone factor, or what I refer to as the horse getting out of the gate) at the top of the list of factors that determine whether or not a revolver and cartridge will accomplish the desired results these guns are supposed to be designed for--in the case of big bores, knocking down a big steel ram at 200 meters or a big bull elk at 200 yards (the intelligence factor, or what I refer to as the horse finishing the race--first!);
3. Our .445 SuperMag delivers all that in a revolver that was designed to eliminate and/or isolate the shooter from as much of the negative forces (equal and opposite reactions) of recoil and muzzle climb as is physically possible (check out our compensator system--reduces both negative forces by as much as 61% with absolutely no reduction in velocity or accuracy--all the power and performance with a lot less punishment!), thereby delivering the above-mentioned performance in a revolver that is much more pleasurable to shoot.
Check out the load data for the .445 SuperMag on our website (300gr @ 1575 ft/sec with CUP @ 44,300 w/ 30gr of H108--that's enough to take down any whitetail, muley, grizzly, bull elk or steel ram @ 200 meters, don't you think?).