[jester]

Well I do not know the temp of tracers, but they are hot enough to cause wood and brush to smoke, smolder and burn, so I am going to assume it is going to cauterize, or at least the initial entry wound which really is all you need. If there is internal bleeding that remains in the bodies cavities, I forget the term but good, because it is nstill blood loss, whats worse it will impact the the other bodies systems. Imagine you are bleeding into your abdominal cavity or chest cavity, it will then make it harder to breath as you are now having to fight the internal pressure from the blood to just expand your lungs.

I personaly would say a low velocity pistol caliber would be the best with a heavy slug so it does not turn into a through and through wound. As stated, an exit wound is usualy larger, more blood and sometimes bits and pieces. Again something that is unusual enough to be noticed. Imagine the victim is leaning forward on the trench wall. You shot him, but he is being held up on the wall, and everyone just thinks he's asleep, so they do not bother him. That is your open door to going through that position. As people will think it is manned there is a body there.

Now, imagine the same scenario, but! Half his head has been blown apartm or there is a fist sized ooozing hole in his shoulder with blood splatter and bits of flesh against the back of the wall, that person will be removed and a replacement will be brought in, and all you have is one less enemy, but you don't have an open door to move through unchallenged.