A good article at Ammo Land on the "50/200 Yard Zero Simplified for 5.56 and .308 Rifles." The basic idea of this zero is that if you zero at 50 yards, the bullet should pass back through the zero again at 200 yards. "This means," the article explains, "that within this distance, your point of aim and point of impact will be very close, minimizing the need for adjustments. This is particularly advantageous in dynamic situations where quick target acquisition is crucial."
The article describes the advantages to the 50/200 zero over other commons distances used for zeroing a scope, and goes through the process of zeroing the rifle for 50/200 even if you do not have a 200 yard range. Part of this includes bore sighting the rifle at 10 yards, and the article includes a link to a sight used for bore sighting at that range.
Finally, the article discusses the ballistics in more detail as well as pros and cons with the 50/200 zero.
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