I do understand that MOA is not exactly 1" at 100 yds, 2" at 200, etc. I know it's slightly more than that. but to start out it really isn't going to make that much of a difference. besides, if i'm shooting at a target with an 8-10" vital area and not a bulls eye the size of a dime, being that precise with MOA isn't going to matter-especially if only out to 500 yards. When I get comfortable being able to shoot that far without any troubles, I will increase my skills by learning to be as exact as possible. But, like said before, for all intensive purposes, it isn't necessary to be that exact starting out. But I am aware and eventually I will put those into my calculations. When I make a solid dope chart, exact MOA with be used in the calculations. but that will be a while.