All things being equal, said BG will bleed out faster from a .45 than a 9mm
Y'know, I keep hearing this touted as the reason for carrying a "bigger" caliber, but, the truth is, it's not exactly correct.
A human body is neither a static nor "constant" thing... A person that has a higher heart rate or blood pressure is probably going to "bleed out" faster from a 9mm wound than someone with lower pressure/heart rate with the exact same wound from a .45 or .50 caliber bullet.
Then there's the size of the person's arteries and veins... Tear through one, and it's only going to "leak" at a given rate, no matter if there's a quarter of an inch of it missing, or two feet. It also doesn't much matter if there's an exit wound, since a person can bleed to death internally just as quickly as they would with blood gushing out on the ground.
The blood volume or capacity of the person being shot is also going to play a pretty big role in how fast he/she drops, as well as things like how quickly their blood clots, how sensitive their brain is to shock, etc.
The bottom line is that none of these variables are apt to be affected much by a couple of hundredths of an inch of projectile diameter... it's going to come down to circumstance, the individual that's being shot and his/her physiology, the location of the wound, and....plain old blind luck.
And as for our wanna-be coroner/forensic pathologist.... all he can really tell you is what rounds where present in the corpses he's viewed, and how many of those rounds there were... I seriously doubt he can tell you how long the person was or was not active after the bullets struck.
So, while this thread and the one that it links to is an interesting read, there's really not much that can be gained from it, as far as a "which is the better caliber" argument goes.
J.C.