Now this is coming from someone who has owned only one Glock handgun, a G17 9x19 for 21 years. Question: Why has there been over 100 years of fussing with handgun calibers when the 9mm bullets are trying very hard to be a larger-diameter intruder into a felonious body by having a hollow point and is driven at 1200 or so FPS. Of course, such a bullet is designed to expand and deccelerate by several hundredths of inches and several hundred FPS. In other words, such 9mm bullets want to end up being an 11mm bullet at 900 or so FPS. That is the designed intent anyway. Now bullet expansion in soft primate tissue is not 100% reliable, so the question is: Was John Browning a pure genious when he invented the .45 ACP cartridge over 100 years ago? A .45 ACP 185-200gr JHP bullet easily accomplishes what the 9mms have been trying to do for over a century, that is, being a .45-caliber bullet tearing through soft tissue (and hard tissue, for that matter), at 900 or so FPS. Why am I not surprised to see that more and more LEO agencies are moving from the 9mm up to .40 and .45? Should the 9x19 cartridge be retired?