Opening day of shotgun this year. I put a cantilevered barrel on my 1100 with a Burris scope. I sighted in with two boxes of Sabots and was looking great. The night before opening day I noticed that my rear scope thumb screw was loose and the scope was moving up and down a bit just in the rear. It was too late to get to the range and check zero so...I went with it the next day. Guess what happened? 9am, I see a nice buck about 60 yrds away, lined him up, fired and didn't see him. Figure brown down..nope, here he comes closer hopping broad side and stops about 40 yards away, bang, miss..then one more time, bang miss again, WTH. I went back to the range the next day and found that I was now shooting 3 inches low at 50 yards and almost 5 inches low at 100. Live and learn, little 242 Locktite goes a long way.