I've lost one deer, a doe, 4 seasons ago....it was a marginal shot with a crossbow, I held too high I think.....anyway I spent 7 hours looking between that night and the next couple of days but never found her....felt really bad about it. But one lesson I learned from that was not to take chances with a mariginal shot, I owe them that I think......now when I release or pull the trigger I only do it when I feel sure of the shot.....