You already answered your own question, I think
There are so many things that can go wrong.
1) you must hit a vital structure and penetrate it. The brain is the only sure thing, to bring down a deer using an ice-pick, so accuracy must be within minute of ping-pong ball (MOPPB).
2) you get NO expansion, so you have to depend upon #1
3) trajectory is so bad that it makes MOPPB accuracy quite unlikely.
4) even if you hit the head, there is a reasonable chance for deflection off the skull, so you could horribly cripple the deer.
5) shooting the deer in the body cavity is not at all likely to kill it quickly... there will likely be little or no blood trail.
Hogs....that's a different story. Try it on them first, to see if you can do it, and that will likely dissuade you.
YMMV