Without immediate medical attention, shooting someone in the leg can cause more blood loss than tossing a hemophiliac orphan through a plate glass window.
The problem with using a tourniquet to keep a wound from bleeding out is that cutting off the blood from other parts of the body to the injured area is sort of like blowing up the city’s Water Works because you can’t get the faucet in your kitchen to stop leaking: It’s a bit drastic and someone will <a href="http://http://firstaid.about.com/od/bleedingcontrol/ss/bleedingsteps_4.html
“>probably die because of it.