True, the other thing missing is how do the various projectiles work if they hit bone and/or have to go through glass first.

Ripp, I am glad someone picked up on my "Holes in it" bit. I had it typed before I had thought of the pun. Like a lot of people I would rather a projectile/round that will get through a bit. Some of the 9mm rounds can not be relied on to take out the brain stem with a shot from the front as wont get through the teeth and other bones.

With the Glock I found I faster back on target with a 40 cal then +P 9mm. 9mm subsonics is another matter.