So first it’s important to realize that a bullet is not a laser. It will fly mostly straight but it is effected by gravity. So the path a bullet takes will form an arc. The faster a bullet travels the longer that arc will be.
Now imagine a line going through that arc starting from the gun. This is the aim line or where the point of aim will be relative to the path of the bullet. When sighting in a rifle we “zero” it. That the sight are aligned at a target at a distance where the arc of the bullet and the aim line spend the most distance as close as possible. This ends up meaning a line that intersects the arc in 2 places. It leads to only a couple degrees of variation from the point of aim. From the zeroed distance, all the way out to just beyond the second point of intersection the bullet will stay well withing what one would consider a “hit” for what they’re aiming at.
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