This is the time of year the sense of urgency builds and free time is short. I have noticed over the past few years of continuous learning and trying to stretch my range, that my worst days are the hotter ones. I had myself and 3 other rookies out all trying to shoot at ranges up to 400 yards. 200 yards was pretty consistent, but at 400 yards everything really opened up. Went from 1-1.5 moa groups to 3-4 moa groups. All guns are verified .7-1.0 moa. Temps got into the high 80's, with wind gusting from 4-8mph. Mirage had the targets dancing pretty good. I've not paid too much attention before to how much affect this really has, but I wanted to ask if it could be a big part of the consistent problems. I know there are so many variables, but it doesn't make sense the extreme changes from 200 to 400 yards. Basically we just try and aim for the center of the dancing bull. Guns with magnification over 12x were adjusted for parallax. I also notice that a few guns with near max loads had maybe 1:4 shots with sticky bolts, but not hammer needed or anything. Would that even effect accuracy, all other things being equal? Same guns shot consistent sub moa groups the am before when temps maxed to 65deg at 200 yards.