I don't know how important energy is, as a measure of "power"? The classic "stopping power" formulas - Hatcher's, Taylor's - put the emphasis on momentum. Full-power .357 and .30 Carbine aren't that much different. Where the Carbine has a huge advantage is in hitting. It's easy to hit targets out to 150 yards with a Carbine, while most people are out of their depth with a handgun at 150 feet, or even fifty feet.
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