Oh you & I agree, energy dump doesnt exist & is not magic. If all that was required was land 500ft# once on target, well everyone would carry a 357. Gunfights have proven that ME only matters in making the bullet work. Much of that work is done deforming the bullet. Thete is no direct correlation between energy & a bullets ability to stop. You can computer model it all day but it means nothing to the individual target in the fight. Accuracy at speed with enough energy to deform the bullet & reach vitals. That simple. There is no additional psychological affect, as some would claim, being shot is being shot. So it always comes down to what you can hit with quickly. If your first shot fails to stop, you now need more accurate hits. If you cant deliver that, then you are likely to fail against your attacker, regardless of what he is armed with. I have moved more than one shooter off their 40 or 45 compact because their hit ratio at speed sucks. Since good bullets with good hits fast is really all that matters, one needs to honestly evaluate their skill set vs their weapon/caliber choice. Merely carrying something bigger than a 9mm & believing you are good to go is just beyond foolish. Btw, lesser calibers fail more often because they lack mass & enough vel to exoand the bullet & drive it deep to vitals. 124/9mm +p, 40, 45, all About 400ft#. So does anyone really believe adding 100ft# matters? I think not & gunfight stats say no it doesnt either. That is likely where some will say they are all the same. In a way, true, but it always comes down to the bullet. If my choice were 44mag with solid vs 9mm+p w/ 124gr jhp against people, I am choosing 9mm all day.