Just so you know, MOA at 600yds is no more accurate than MOA at 50yds, as far as the rifle itself is concerned. One MOA (minute of angle) is just a measurement of an angle (think of measuring an angle with a protractor) that equates pretty close to, but not exactly, one inch at 100yds. It's about half an inch at 50yds, and about six inches at 600yds. As has been said, though, it is a very rare shooter that has the equipment (wind flags, etc) and skill to read that equipment and shoot groups of less than one MOA out past 500yds.