Gun4Fun - All are welcome to their opinions... heaven knows that that is why there are Fords and Chevys. But rest assured that one certainly will not be winning many friends when attempting to belittle another contributor in the opening line of a post, whom you do not know, in some misguided attempt at gaining credibility.
I would not waste the energy to attempt to enlighten someone that has obviously made up their mind about a topic, for fear of their only being confused by the facts... but, because many are new to the shooting sports that want to be able to gain knowledge through the collective experience of others... I'll not allow them to accept as truth, what you are attempting to sell.
All that have a grasp of ballistics, know that any argument of Momentum vs. Muzzle Energy is ludicrous. It is equivalent to someone saying "It's not about speed, it's about velocity!" They're exactly the same thing.
Muzzle energy is derived from the formula: 0.5 x mass x velocity squared… or, in other words, the product of mass and velocity.
Momentum is a measure of the motion of a body, equal to the product of mass and velocity at a rate of 0.5 x mass x velocity squared.
Not one bit of difference.
It also shows the absurdity of FunnyGuny's assertion that it's all about 'momentum', and that "It doesn't matter if you have 1000 fp. or 10,000 fp" of energy. Again, because they are the same... more is simply more.
All that kgpcr wanted to know was whether there was really any difference between the .44 Magnum and the .454 Casull.
And there is a world of difference.
The .44 is actually only .429" inches in diameter. And, while one surely could reach higher energy levels with duplex powder charges, the manufacturing industry standard for the magnum round hovers between 800 and 850ft-lbs. (I was generous in my earlier post, by using the 971 figure that indeed is available, though not the norm, not wanting to appear biased.) On that same note, energy levels for the Casull can be achieved well above the 2000ft. lb. mark... but, even the factory loads develop such extremely high chamber pressures already, (60,000 CUP) that Small Rifle primers are used in the chambering because of their added strength in construction.
This isn't regurgitation of some want-a-be hype, or the drivel of an "armchair theororist"(sic), but simple physics, fact, and real-world experience... (among which was six terrific years with the AMTU.)
kg--- , PM me and I can send the pictures of the moose I've taken with the Casull. When you run into a brownie, the time that you'll be allotted to clear leather and send a round down range may easily be limited to a single shot. Make it one that gives you the best chance of telling your story to the rest of us...