If you're burying the front sight bead in the rear sight notch (top of front sight even with top right & top left of rear sight blade, like: T\I/T ) - then the bullet should cross the line of sight (aka: zero) twice:
once at about 21yds, on it's way above the line-of-sight; and again at about 75yds, on it's way back down.
At any other distance, the POI will be either higher or lower than the POA.
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