Bottom line is that to drop an animal consistantly in its tracks you need to take out its central nervous system with a brain or a spine shot. You are not going to knock one down with the energy transfer from a peice of lead less then a 1/2 an inch in diameter no matter how fast you can shoot it.
The above quote is spot on in my opinion. The energy dump theory has pretty much been proven to be wrong. Seems a lot of people don't understand what kills a deer. The only part bullet energy plays is expansion and penetration. Living tissue is elastic and will not compress from a shock wave but simply bounce back to it's original position. As stated above a disruption of the nervous system by a spine or brain shot as well as a disruption of the blood flow to the brain is what drops a deer. The latter being the majority of dropped deer in the field.
Interesting opinions being shared in this thread, and most are right on given the context in which they are given. Lots of reading, writing, experiments, more writing, etc has gone into this subject for over 70 years that I know of. It is not without fault that most of the writers opinions and experimentations are based upon incomplete information due to the vastness of the subject itself.
Mass, Velocity, Energy, Momentum, Tajectory, Force and all the other big words that come into play when discussing physical (and non-physical) properties of bullets and game animals are used but lack scientific concentricity. For example, in the blanket statement above......"You are not going to knock one down with the energy transfer from a piece of lead less then a 1/2 an inch in diameter no matter how fast you can shoot it." Is this extrapolated from something proven by Newton or Einstein? Is it a theory? Fact? or something rarely seen? Where did this come from other than someone's opinion based up their experience?
Several years ago I took a shot at a really nice buck. It was my first time hunting with this gun and I was in err for not knowing my tragectory. Rather than hitting the deer in the shoulder, I hit it in the far front knee. That deer's leg shot out and the deer actually went up in the air and hit on it's back. If not energy from the bullet, then what caused the deer to somersault?
Several friends and I were on a hunt in Wy this last fall. Some of us had doe tags. A buddy decided he was going to shoot his doe in the head so no wasted meat. At his shot, the does head flew back so fast the antelope spun nearly 180 degrees before hitting the ground. If not energy from the bullet, what caused the antelope to spin around. Head shot, so obviously no nervous system left to make it walk. Front feet were even off the ground so it wasn't stored energy in some capacitor receptor or something making it turn around.
Both of the above stories were using 270 Winchesters. I was using a 150 grain bullet when I hit the deer in the knee. I don't know what Dave used on his antelope.
Same trip in Wy a buddy and I were shooting at prairie dogs. When he shot, you heard the splat and saw the dog laying there kicking. When I shot, they flew up in the air. He was using a 257 Whby and I was using 243 WSSM.
Years ago this thing called "Cowboy Shooting" came out. Several friends were at the same range as I. I was shooting a DW 357 Max with 210 grain bullets. My friends were shooting 45 colts "Cowboy" loads. I had been shooting at steel targets out to 200 meters. They were shooting bowling pins at 25 feet. They bet me I couldn't knock down 5 bowling pins in a row. I told them I would agree with them. At 25 feet, my load was going too fast. It would hit the bowling pin and go right thru. They laughed. 5 pins up, I shot 5 times and hit every pin. Pins hardly wiggled. They said I missed, or just skimmed them. I told them the bullets went thru. Even showed them the exit holes. They called BS. I suggested we take it back to 50 yards and try again. At 50 yards 5 shots and 4 pins off the table. One just wiggled. Same bullet, same load, so why the different reaction by the bowling pins?
Same DW shooting silhouette chickens at 50 meters. When hit, the chickens fall back and just disappear out of the sight. A friend shooting a 445SM next to me and the chickens flip in the air and fly back. I told him to quit shooting them low, but he liked the way they fly.
"For every action there is an equal and opposite reaction." "Waves will continue in one direction until an opposing force redirects them." "Prairie dogs fly, I have seen this with my eye." These are a few quotes taken from books I have read.
They kinda fit in with the quote from above, "Living tissue is elastic and will not compress from a shock wave but simply bounce back to it's original position." Shock absorbers on a car are supposed to keep forces from bouncing back and forth, but even with new shocks I bet you cant apply force on your car and make it "simply bounce back to it's original position." People are what, 90% water or something like that. So are most animals. You think that shock wave from bullet impact simply bounces back to its original position and stops? You ever see a wave in a lake go one direction and just stop? How about a ripple in a glass of water from dropping in an ice cube? When you hit an animal, that shock is going throughout it's body, finding resistance from muscle and nature's survival instincts, and bouncing back and forth. It's just like rocking a boat from a wave or your ice cube bobbing after you drop it in your glass of water.
In order to sanely take an animal, you need to take away it's electrical impulses and/or oxygen supply. The faster you do this, the faster the animal dies and the better the meat. The secret to this whole hunting dilema is figuring out how to do this the fastest with the least amount of damage. Can you figure it out?
Lots more to this story, but enough typing for now.
Steve