Put it this way, is the .45ACP so much more superior to off-set the .40S&W's advantages such as higher capacity and more ergonomical and lighter weapons. IF you want a double stack .45ACP get ready for one heck of a grip. Most .40S&W are actually hotter than .45ACP loads. Some .45ACP barely have more energy than 9mm loads. The drawback to the .40 is that it has a lot of pressure and recoil. From my experience it has more recoil than the .45ACP.