I shot in my first high power match yesterday, a 600 yard prone match to try out for the Missouri Junior Highpower team. I made the team, and did "well" I was told, kept getting congratulated, but I'm not pleased. I shot a 178, 166, 177, 174. The conditions weren't the best, but I'm used to 190's in smallbore. I was using a new to me stock, DPMS AR-15. The sights really messed me up, I couldn't keep a good vertical group. Here is a typical target of yesterday, could anyone help me with keeping a tighter vertical dispersion? I felt I handled the wind pretty well, it was blowing a bit, but I really think I should have done better. The first couple shots I was finding my zero, I was high then adjusted too much, then I got in there better. My ammo had gotten sat in the sun by someone.