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The traditional way for military rifles with iron sights was to zero at 25 yards. That would also mean a 300 yard zero. But between 25 and 300 yards the bullet would be above line of sight. Several inches high, and enough to miss if you're shooting at a smaller target. But the original iron sights were designed to work with this method.
On my AR'sn with optics I just zero at 100 and go from there. That works better for me. And now that the military is using optics on all of their rifles I don't know how they are zeroing them.
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"If you're still doing things the same way you were doing them 10 years ago, you're doing it wrong"
Winston Churchill
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