Without any more information (muzzle velocity and ballistic coefficient), I would recommend sighting in 2" high at 100 yards to be close to zeroed at 200 yards. If you sight in 3" high at 100 yards, your zero will more likely be somewhere between 250 and 300 yards and you might be as much as 4-5" high at 200 yards. Longer range trajectories are much more sensitive to details such as muzzle velocity, ballistic coefficient, and air density.
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