Darn, really sorry to hear that KT.
I would have thought you'd have found him from the description of the shot. Any chance someone else found him and got him out of the woods on you?
Keep your head up, things will work out for you. As for your doubts in expandables, I've never hit a deer with one to say for sure. But my experience is if you have doubt, go with your gut.
Good luck for the rest of the season bud