I wouldn't worry about foot-pounds of energy if you stick with a good caliber and a good brand of ammo. 9mm and .40 will act similar with most barriers, so you're getting more recoil and less capacity to have very marginally better ballistics. Idk, I've been hearing more and more people say they like the .40 for carry/HD more, but I still would personally prefer more rounds on target faster, higher capacities, and cheaper training costs. Nothing wrong with the .40 at all, I just think the 9 does most of the same stuff and has other advantages.


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