I know this has probably been done but I didn't search and am interested to know the results. I have personally become attached to the .40 cal round. Whats your favorite? I know there are other rounds but I just posted the more common rounds. Feel free to list yours if you like something other than whats listed.
.380 ACP
.9 Luger
.40 S&W
.45 ACP
.380 ACP
.9 Luger
.40 S&W
.45 ACP