Re: 2 MOA impact change at 700 yards?
20 degrees can change your POI at 700 yards as can pressure. Did you document the barometer both days?? That can change rather fast and have a HUGE impact on your POI espesially coupled with a 20 degree swing. Although both together most likely wont account for 2 MOA but could account for 1 MOA. Different lighting conditions can play in on this as well. Also, since it was colder, your ammo could have been slower in the velocity department. All things concidered and 2 MOA at 700 yards isnt bad. Learn why and compensate for each and every variable. 600 yards is the threashold for "forgivness" from air density changes and such. 700 yards begins a whole new ball game.
Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.