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The argument that was presented is that kinetic energy is the primary deciding factor in regards to a round's leathality and if that's the case, the 9mm can be just as lethal as the 45 ACP. It was in response to the hype surrounding the 6.6 CM.
normal calculations of energy suggest that the 115 FMJ going around 1175 FPS has more energy than the 230 FMJ going around 850. there is no doubt-based on what I have read including the famous Hatcher studies, and those of Evan Marshall and others later on-that when limited to FMJ, a 45ACP is a slightly better one shot stopper than a 9mm. With modern expanding ammo-its inconclusive. I also believe that with FMJ, the lethality is up on the air-usually, the deeper the puncture the more likely death is going to happen and a 9mm FMJ usually has better penetration