The inverse of power-to-weight, weight-to-power ratio ( power loading ) is a calculation commonly applied to aircraft, cars, and vehicles in general, to enable the comparison of one vehicle's performance to another.
12.
Smith & Wesson then decided the 10mm Auto was too much cartridge for the reduced power loading, and that the . 45 ACP sized guns that chambered it were too heavy and bulky; out of this came the . 40 S & W, a shortened 10mm Auto case, designed to fit in a 9mm-sized gun, with a reduced pressure loading that allowed a lighter, easier to shoot gun.
