If a bullet groups 1MOA AT 100yds it will produce a group of just over 5" at 500yds unless the wind blows 'em all back towards the center. Typically, only very gifted shooters with good eqpt can maintain the same accuracy at distance as they get at 100yds. One thing you can count on, is that once a bullet sets out on its path..it does not "steer" back on course! It does not "go to sleep" or get more stable. If you are getting consistent 1/4MOA groups over 500yds, you are IMO a gifted shooter.
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