Not just one human body, but several.

It pretty much depends on how far away you are from the person and what type of ammo you are using. .45 is a thick and heavy bullet which will not carry as far as a 9mm or .40 S&W (although .45 has alot more stopping power.) The further away you are the less power the bullet has. Ammo type is another. You can buy what they call a "safety slug" which are suppose to enter the body and not travel through it. This is good for home defense. If you don't have (or want to get) safety slugs, then stick with the hollow point round. The hollow point round is suppose to hit the target and expand (like a mushroom) inflicting the most damage w/o traveling through the target. Hope this helps.

Depending on the grain of the bullet yes. A 45 caliber can be considered just as powerful as that of a 44 magnum grain bullet. There are many variables to consider however. These weapons, though powerful are considered among self defense enthusiasts as being the next level type rounds above the basic "Man Stopper" round. A lighter grain bullet like that of a 38., 38+P, and 357 wadcutter are considered the desireable man stopper round for self defense. They are generally a heavier grain bullet with a reduced fps (feet per second), the recommended fps for a man stopper round is between 750 and 950 fps. Were as a more powerful weapon like a 45 will cause more damage, and make more of a messy exit wound, the lighter calibers will lodge into the flesh and bone of the assailant, the resulting force from a lower fps is more than likely to throw or push the assailant backwards from the resulting psi of the impact. If an assailant with a knife is coming at you at a full run, shooting him with a big caliber gun may not stop the force of his weight from still coming at you, however a bullet with a lower man stopper fps is going to knock him back on his butt.

I'd be willing to bet that a .45 would almost always enter the body. But most of the time its gonna stay unless you miss bones.

It depends on the exact situation. There are several reasons that you do not want a bullet leaving your target's body. A bullet that enters and leaves the body has not given the target all of its energy. A bullet that lodges, on the other hand, transfers all of its energy to the subject. This is why military and armor piercing rounds are not as good against people and animals as hunting rounds. Just ask a soldier. Putting lead in a criminal is also a good way to make sure they go to the hospital to avoid getting lead poisoning, where they can be arrested. Another reason you want a round to stay in the bad guy is you do not always know what might be behind the target. A lodged bullet will not break your antique lamp, dog, or other family member.

There is no better way to explain this question great job! Too easy! However, it also depends on what part of the torso the round travels through! Whether organs and bone are hit or a clean pass. A myriad of variables here.

It really depends generally yes it'll go through and leave a pretty big hole in the process; however, if it hits bone it might not. You also have to look at the range you are firing from and the amount of "material" it has to go through.

Most pistol rounds or small calibre bullets tend to stay inside the body - infact a great deal of rounds (hollow point being the most common) are made specifically to stay inside the body, thereby putting all of their energy into the person rather than the wall behind them. I think that if it is a 'full metal jacket' or solid slug type of bullet (forgive me if I don't have the lingo quite right : P ), then at a close range it will go straight through a person (unless you hit bone, then it might not). If it is a hollow-point (or tumbling round, though I don't think you really get that with pistols), then if it's doing what it was made to do, it will stay inside the person and inflict -massive- amounts of internal damage instead of simply creating a hole and hitting the wall behind them.

Lets put it this way. If it bypassed the bones I would say yes. I shot a horse that was hit by a car and was in great pain. And as I always do. I line the target up with a solid item like a tree or ground so that the bullet dose not harm anyone or thing else. After shooting the horse and making a clean shot. The bullet entered the tree behind the horse. There was another time when the type of bullet I used exploded in the body. All depends on where the target is hit, what type of bullet & distance the target is..........M.C.S.