I was shot in the hand by a perp with a 22 cal bullet in North Carolina. You most likely WILL experience shock to some degree. I just couldnt seem to keep my feet under me long enough to stand up. I thought I had tripped over something and fell into a patch of oil. Even so, once I figured out that the oil was MY blood and that I was hit, I mannaged to still return some sort of effective fire until help arrived.
FEAR is the mind killer.
Think it, and your body WILL respond.