optimum sighting zero for a .22 is something like 62 yards, it gives you the maximum range where you will have the smallest amount of bullet deviation from zero to the bullets max effective range. I forget where I heard that maybe gunblast...I use it. Similar to how the AR15 utilized a 300 yard BSZ (Battle sight zero) to optimize the flattest trajectory of the bullet for the longest range with the smallest deviation from the POA (Point of aim)
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Math>Grammar
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