Many argue today that new bullet technology has changed everything, but they are ignoring a few key points. First, that technology applies to every other cartridge, so while it has advanced the 9mm’s terminal performance, it has also advanced the terminal performance of every other cartridge equally. The 9mm remains on the bottom rung when comparing the big three defensive handgun cartridges: 9mm, .40 and the .45 ACP. That’s simple physics. Yet, the trend has moved away from the .40 S&W in favor of the 9mm both in law enforcement and civilian sales. The lower recoil of the 9mm seems to outweigh any thoughts about terminal performance.