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When a bullet is fired it typically meets your line of sight twice, once on the way up and again on the way down to meet your zero, much like throwing a rock - more distance untill target = higher trajectory needed untill it comes down to hit target. The faster your bullet and higher your ballistic coificent is the less noticeable this is. What they (Army) probably did is zeroed at 300 then moved in untill it was on zero again. If you tell me what ammo your using and what range you want your rife zeroed I can give you the first point of intersecion...
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