One of the things missing, in my experience, from training for the hunt, is shooting at moving targets.
A GREAT method of doing this, which recently has made its way into every rifle training session for me, is using an RC (radio controlled) vehicle with a mylar balloon attached to its antenna.
My son drives the off-road RC machine with the inflated balloon attached to it down range and across the impact area, from one side to the other.
Shots on this balloon are very difficult initially, running the little RC car about 25 miles per hour across the lane gives you a very interesting look at an animal on the move.
Give this a try and see how your rifle shooting holds up (it will improve dramatically).
I have found .223/5.56 to be perfectly suited to small deer with 75 grain ammo. I have killed many with either an AR or a TC Contender in this caliber.