I had a half day off work today. I figured the only way for me to settle "the caliber dispute" in my own personal bubble was to do my own testing. So I took the the three pistols that work well for me this time of year and headed off to the range at my LGS. I fired three, nine round strings ,three rounds at a time at about 10 yards at 6 inch targets. I tried to be deliberate as to not influence my shooting from one gun to the next. Here's what I noticed. In the end, the 9MM went 24 for 27, the 40 S&W(Glock 23) went 22 for 27, and the Glock 30S(45ACP) came in at 18 for 27. After that was finished, I continued to shoot with each of them randomly for about the next hour. I finished the session by putting up the same sized (6 inch) target I used for the earlier test one at a time for each pistol. I shot 5 rounds with each at about the same pace as I did with the test. I went 5 for 5 with each of them. There is nothing scientific about what I did. I made this test up as I went. I can tell you that what I took away from the session was that I think that I would have better results in the event I had to use the 9MM for self defense because my results were better with it when I first started off cold at the beginning of the range session. Anyway, it still beat the hell out of working a whole day!