.45ACP doesn't have much powder in a cartridge as it is a low pressure round that is loaded with a fast powder. That keeps it from having a lot of recoil, much as with the 9x19. The 9x19 has a higher pressure, but the amount of powder is low, which is what matters in the recoil equation, not pressure. If you want recoil, look to the magnum revolver rounds with 15 to 20 grains of slow burning powder. I like 'em all, myself.