One of my hunting buddies and I were out this past Saturday and he made a similar shot on a 9 point. Tracked for about a half mile, at which point he started going up a ridge...not good, right? Well, about 50 yards up the ridge he started running sideways along the ridge. 50 more yards and there he laid. After we found him, drug him to the truck and drove to the creek to field dress it, only one lung was hit and it was only clipped. There was a bit of shoulder damage, but I believe that a decent one lung shot will kill the deer. Good luck with your continued search.