Don't listen to this stuff. the .40S&W DOES NOT have much more power than a 9mm. In terms of preformance the two rounds are basically identical. In equalvlant loadings, a .40s&w will have a bullet only very slightly heaver, very slightly slower, and one mm wider. The effect on a human target will not be noticably different. If you don't belive me go to the store, get a box of each, and compare the factory data. The difference in almost noexistent.
9mm ammo is cheaper, you'll be able to practice more. But really, It come's down to whatever works the best for you. Worry about the model of the gun, not between 40 and 9.
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