I always love a good caliber thread. When I go hunting I still take a 10mm not a 9mm, although I did have to kill a charging boar with a 9mm and it did it rather well. I'd suppose if my shot placement wasn't excellent it would have been different, or a larger pig.
My take away from all the excellent info is, if the bullet isn't traveling at least around 2200 fps then shot placement is the most crucial element of being successful. If the bullet is going over 2200 fps then we can have a slightly worse shot placement and still have a pretty good chance of surviving.
Although now we get to shotguns, which are still devastating at close range provided it isn't birdshot. So where does that devastation come from? Is it more just from multiple projectiles at once?