Sorry to hear you didn't find him. If you were using the Mechanical Style Broadheads, they do make a loud WHACK when they hit and open, at least the ones I've used do. Is there anyone that does Deer Dog Tracking in your area? Down here there are a bunch of dedicated Guys and Ladies that have trained dogs just for finding shot deer. It has amazed me once I started to follow their Tracks just how many deer they recover that the shooter would of never found on their own. Many have stopped bleeding and some never did but a drop or two. Really opened my eyes to deer from my past that I figured I missed that I actually probably killed and never knew it.