Sorry, to disagree again... but NO,NO,NO..... Blood pressure is pressure within a closed system, once the system is opened due to trauma (aorta, carotid, or even lung shot, etc) the heart will attempt to increase arterial pressure by beating faster. This is only if the heart has the ability to function (ie lung shot). If the heart itself is destroyed, it cannot beat at all and BP will drop and the animal will lose consciousness and die. Presuming you get a double lung shot the BP drop will follow a different pattern. The lungs will begin to fill with blood as the heart will continue to beat, eventually as the lungs fill, BP will drop and (more than likely the animal will die of asphyxiation....not blood loss. The problem with this is that the heart is still able to function to capacity and pump far more blood that it could have with a heart shot. Sorry guys it’s a scientific fact. Double lung shot deer could hypothetically run 75-100 yds. (dead none the less) Heart shot deer maybe (big maybe) 25 yds. Take out a shoulder AND the heart and he won't even take a step.

Bigbulls, as much as I hate to disagree with you, your talking about VENIOUS pressure (i.e. un-oxygenated blood returning from the organs), not at all the same as the instant lose of OXYGENATED blood to the brain.

zrex, it has nothing to do with how much the animal bleeds....understand this, without a constant uninterrupted (FRESH) blood supply to the brain the animal will be brain dead in a matter of minutes and on the ground in seconds due to hypoxia. I'm not arguing that an animal might not bleed more from a double lung shot, what I will argue is that a clean heart shot will drop any animal faster than a double lung (all other factors aside). Your only valid claim with a lung shot is that it will certainly result in a dead deer and presents the hunter with a larger vital target and the increase in blood trail will make your animal easier to find. Just remember if you would have heart shot him you wouldn't be trailing anything.