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Zero Adjustment
Represented in MOA (Minute Of Angle), it is the amount by which you must adjust the sights to zero at that particular range.
For example, if your rifle is zeroed at 200 yards and you wish to increase it to 250 yards. Look down the table headed ZERO-ADJ(MOA) and find the Zero-Adj value which corresponds to 250 yards.
If your rifle's scope precision is ¼ MOA at 100 yards and the Zer-Adj value read 2 MOA, then that means 8 clicks (i.e. 1/4 MOA = 0.25", so 2/0.25 = 8) in the direction which raises the point of impact will zero your rifle to 250 yards.
(NOTE: 4 clicks is equal to 1 inch at 100 yards with a ¼ Moa scope, while 2 clicks is equal to 1 inch at 100 yards with a ½ Moa scope.)