If it was a shoulder hit it is probably a dead deer but almost unrecoverable imo.  I hit one of the biggest bucks of my life in the shoulder the last day of Michigan's archery season years ago in a snowstorm.  By the time I got help to start tracking the trail was covered with snow.  I spent 2 days looking.  The next weekend a buddy had his kids up and I offered them $500 if they could find the deer.  Never found it and the deer was never seen agian after being the talk of the town for years.  I am sick just thinking about it.  It took 3 seasons to get a shot at him and I fugged it up.  Mainframe 12 with junk everywhere.  Probably a 250-300lb deer.  I know 300 pound deer are rare but I have killed and seen plenty of dead ones weighed.  This thing was a TANK.  My guess was 7.5 years old.
Anyway Nate I know how you feel, sometimes it just happens.  Practice is great but shit can go wrong in a hurry with a live animal in front of you.  Shake it off and get back after them.