Originally Posted by sharpsdressedman
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).
A .45 ACP loaded to the same pressure as a .40 S&W is commonly know in the industry as a "hand grenade".
.40 S&W runs at 35,000 PSI, .45 ACP is 21,000 PSI, and .45 ACP +P is 23,000 PSI.
A 50% overpressure in your .45 ACP +P would make things very exciting for you to say the least.