In terms of STOPPING POWER, however, energy spent OUTSIDE the target is wasted and therefore doesn't count. Take really big-bore handguns - like the .44 Magnum. Such a bullet has so much energy that it usually over-penetrates, travelling right on through the target and doing damage beyond that target. That extra energy doesn't count because it isn't spent on the target. It's wasted. 16 www.BulletproofDefenseDVD.com That's why a .357 Magnum, which is a powerful bullet (but has less energy pushing it along than a .44 Magnum) generally has BETTER stopping power than a .44 Magnum. The bullets from the .357 don't over-penetrate as often, which means they expend more energy inside the target.
Report - Stopping Power
To see the actual publication please follow the link above