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The actual power of any given cartridge is based on speed and weight of the bullet. There are multiple different loads for the 9mm Parabellum, and for the .45 ACP. HOWEVER- in general, the 9mm Parabellum has a higher energy than the .45 ACP. Search Wikipedia for 9mm Parabellum, and for .45 ACP. Scroll down for energy figures on the left. It should be noted that almost all .45 loads have heavier bullets, and the .45 ACP is generally considered to have greater "stopping" power than the 9mm.
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