Your client is screwed. Anyone that think THIS nonsense is the angle to attack (no pun intended) is an idiot.
Disagree.
I do this a lot. The jury will be a bunch of country folks who know guns and shoot a LOT of deer.
Nobody I know would shoot a deer at 10 feet with a .223 FMJ and expect the bullet would stay in the animal...headshot or no.
But thanks for your input.