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It wasn't that long ago that 9mm was considered under powered, and .45 not enough ammo. The solution was the .40 cal. Along came a couple of ammo shortages, and .40 ammo got real scarce while 9mm. reputation and tests seemed to indicate that quality hollow point 9mm was indeed a decent self-defense round. Glock has come out with double stacked .45 ACP for those that want to make sure that their defensive load starts with a 4 and can have more than 7 or 8 rounds on tap. The reasons to buy a .40 have narrowed down.

There are a lot of .40s around people bought a lot of them. They are still good guns. But almost any new .40 cal gun today has a twin available in 9mm. More capacity, lighter recoil, more gun choices. cheaper range ammo, tend to make the decision to go 9mm easier