Im wondering if any of you have ever seen this. We live in AZ, so it is usually warm. 75-85 degF. My brother was shooing a 300WM. The load he was shooting is sighted in, and is shooting 3.5 to 4.0 inch groups at 600yrds consistantly. When we went out to shoot today, it was 40degF. The first round out of the gun hit where is was supposed to hit. That round was warm because it just came out of the box in the truck. The next 2 rounds were cold, and they hit 12inchs (2MOA) low. We couldnt figure out what would have caused this. I have heard about snipers keeping rounds in thier pockets to keep the rounds warm so they can have consistant round temps. We went ahead and tried this, by putting rounds in our pockets to warm them up. As the temps of the round came back up, the POI came back up to where it is supposed to be. The load he was using was: 72.5 H4831SC, Fed 215, 208Amax, 2866fps. We thought that the Hodgdon Extreme powders would be better than this, as I have never seen this with any other powders we use. What are you thought on this. Thanks for your help, and ideas.