the quickest drop I've ever seen was my buddy shot a cow elk with an 06, the bullet hit it in the shoulder, broke the shoulder, then bounced upward, and broke its spinal cord, exiting the top of the back. Personally, I prefer shoulder shots, because it lessens their ability to run, and less tracking. Bu tracking an animal isn't a bad thing, it's another part of hunting that takes skill and makes it more interesting.