Good question to stir up some stuff!!
While you do get a few more rounds in a .40, the .45 still packs a harder punch. Think of it this way, in terms of conservation of energy. If a .40 blows right through a target and barely slows down, it has transmitted no energy to the target other than making a hole. A .45, while slower, has larger frontal area, even if unexpanded, and does a better job of transmitting its energy to the target. Given all the variables governing handgun bullet expansion, I go with the .45 since its bigger than most others before it ever expands. More energy "left in the target" means more effective in my book.
I'm old and crusty when it comes to this, big slow bullets rule....
Just one guys opinion, some of you .40 dudes jump in....
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