I checked the screws when we went out that morning and they were all tight. I haven't had a case of buck fever since I was 16 shooting at my very first deer. I never miss at that range, so when I did, it made start thinking about why I missed what I thought was an easy shot. My only guess is maybe the scope got knocked out of whack a little during the trip or the wind was doing some weird things to the bullets. As soon as I get the chance, I'll check my zero again to eliminate that possibility. Would a heavier bullet fared better in the wind?