Well, if you really want to compare the .45 to the .40, and think they are the same in performance, see what the .45 does when it is loaded to the same pressure as the .40 (the industry calls it .45ACP+P). The .40 , as mentioned, was designed to operate at the top of its available pressure margin, so it has little chance to have a +P round that enhances it's performance. I don't fire .45ACP+P often, but it is available for use, shouild you "need" the extra power.
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