Kane Fan said:
dude
a .45 is considerably more stopping power then a 5.56
when the british military considered switching to the 5.56 round the soldiers made many complaints about the lack of stopping power
no one, has EVER complained at a lack of power from a .45
you do realize a 5.56mm is a .223 right?
I heard a story about a Grizzley killed by a .22 but it was basically a miracle shot (the guy hit the bear square in the neck and snaped it's spinal cord, while it was charging him)
Dude, just some basic math here....
Kinetic energy = 1/2 * (mass) * (velocity)^2
A 62 grain, 5.56 mm round traveling at 3025 ft/sec gives you about 1,259 ft-lb of kinetic energy.
A 154 grain, 7.62 mm round traveling at 2104 ft/sec gives you about 1,513 ft-lb of kinetic energy.
A 230 grain, .45 ACP rounf traveling at 850 ft/sec gives you about 369 ft-lb of kinetic energy.
Mind you that these are just calculations based on muzzle velocity of Wolf brand ammunition, but run true regardless of manufacturer. This doesn't even take into account the "spall" of the higher velocity rifle rounds once inside the body's soft tissues, which also causes considerable damage.
Now, I don't know about you, but having been in the military, and having seen first hand the effects of both rifle and handgun rounds on humans, I can say these things:
1. When a person gets hit by a handgun round, they pretty much keep doing what they were doing before you shot them. They don't knock people onto their asses like in the movies, as they simply lack the energy to do so. Multiple center of mass hits are required to put a person down with a handgun, and even with multiple hits by a .45 ACP, the target usually manages to lumber off somewhere to bleed out.
2. When a person gets hit by a rifle round, one hit usually puts them down if it is center of mass, with the exception of the 5.56 mm round. I can tell you from experience that it usually takes two hits to put a person down with the 5.56 mm round. The internal organ damage from the "spall" of a rifle round is usually enough to ensure death without prompt medical facilities.
Now, a bear has considerably higher bone density than a person. So, whereas a handgun round can fracture a human femur, it will not do so to any except the smallest of bones in a bear. Also, as was mentioned earlier in this thread, bears have considerable adipose tissue, which a .45 ACP round will most likely fail to penetrate. The end result, shooting a bear with a handgun will probably just really piss it off, unless you are very lucky.