I've decided to buy a .338LM. I need to buy a new scope, but I am unsure about what magnification to get. My questions are "What power do you actually use shooting 1000 or 1200 yards?" "At what power does mirage become a problem? (Note that I live in the desert)" "Does anyone use a fixed power such as a 10x56?" "Has anyone tried a fixed 10x56 and decided that it was not enough magnification?" Price is not really the issue. I am planning to buy a quality scope (Valvada, Swarovski, Zeiss, or S&B) I may at some point attempt longer distances, but the majority of shooting will be at 1200 yards or less. What would be a good recommendation for 1600 or 1800 yards? Last, MOA or MRAD?