Ok, so when I first got my gun tuned in it was shooting .3-.5" at 100yds. Was shooting very well out to 400 and 600 yards a few months ago. Went shooting few weeks ago and was all over the place (this was at the same 400 and 600yd spot that was no challenge just a few months prior). I just chalked it up to me having a bad day. Went to the 100yd range today with my son. After shooting my rifle I felt like throwing it off a bridge. My windage was perfect. However, my vertical has me on the verge of blowing a gasket somewhere in my cranium. My first six shots at 100yds: 1) 3.5" high 2) 2" high 3) 1" high 4) bullseye 5) 1.5" high 6) bullseye Let the barrel cool. Shot two shots: 1) bullseye 2) 1.5" high Let the barrel cool. Shot two shots: 1) bullseye 2) 1.25" high Let the barrel cool. Shot two shots: 1) bullseye 2) cut the same hole Here is a link to a picture of the target: http://i59.photobucket.com/albums/g309/screamin_chief/IMG_3457.jpg If anyone has an idea as to what the problem is, please enlighten me.