Briman the 45 is better than a 9mm.

I have been shot with a 9mm it went through my chest from the side and in to my upper left arm.

I was still on my feet and in the fight.
The 9mm does not inpress me in the least as a fight stoper.

BTW the 45 colt in a SAA is about equal to a 45acp not way above it in power.

The 5.56 is and avance in arms to some people in some other peoples eyes it was a mistake.

I persionaly belieave the 5.56 with the right loads are cappable arms.

but i will tell you this if i was in a room with some one that was trying to kill me and had only one round of ammo with the choices being the trap door or the m-16 i would take the trap door. Any day

There are a lot of factors on how fmj bullest stop people.
the twist in the riffling and the yaw disined in to the projectile or the lack of yaw in it all has to do with how good of a stoper it is.

Some of the so called experts have said that the new m-16 and the heaver bullets its disined to take over stablise the bullet.
So there is less yaw "tumbling" in pass through.
a pinciel strate hole made by the 5.56 would not be as effective a stoper as a5.56 that yaws and come out sideways.

Any way there is more to the stoping than the cal. the bulliet and shot placement has alot to do with it.