I'm kind of unsure about how to respond to this.
For the record, I've hunted deer since 1980. Sucessfully During the last 8 years I've been on a DMAP. (deer management assistance program)
I also assist in youth hunting programs, where we take kids and a parent deer hunting.
So, that being said, I've field dressed a lot of deer.
Well over 200, and have seen the results of lots of bullets.
Some have devastating results, some not so much, but what I've seen is that one put into the proper area will kill.
The difference is, will the kill occur instantly or take awhile.
Death occurs when blood ceases to flow to the brain.
A shot to the lungs/heart will still allow the animal a few seconds of life to run. They can cover a lot of distance in a few seconds.
Shots to the central nervous system will drop them, but the target area is small.
I've shot them with everything from a .223 to a 30-06, and have never had a problem killing them.
Here is the answer to the whole thread.
Make sure you have a bullet designed to kill a deer, and make sure you know the anatomy of a deer, and where to shoot it.