Why is my shot off at 25 yards after moving my reticles to the point of impact?
There are many factors that affect the accuracy of zeroing. One of the most significant and most neglected is parallax. How a shooter aligns their "aiming eye" with the scope, commonly described as "cheek weld" can have a negative effect. Most scopes have a parallax free focus point at or beyond 100 yards, depending on the manufacturer and/or application. Unfortunately, most scopes make parallax more evident at ranges less than 50 yards.
If a shooter, in aligning crosshairs with a target, experiences head movement, either horizontally or vertically, there is a corresponding movement of crosshairs that can be an inch up or down, left or right, creating a potential margin of error of two inches at the 25 yards. If the shooter unwittingly accepts and incorporates this error into the scope adjustment, this error, at 100 yards, becomes 4 to 5 times the original setting or 8 to 10 inches off!
In other words, if the shooter has unintentionally zeroed in the alignment error (looking through the scope at an angle, however slight), then, in actual shooting, duplicates and repeats the alignment error, the off target inaccuracy is compounded.
The significance of consistent eye to scope alignment is rarely addressed. Consequently, there are many weapons in use today, the scopes and sights of which are adjusted and oriented to an illusionary spot, either "false zero" or the imagined "center" of a triangle created by "groups".
The Absolute Zero can provide you a precision zero if used without error.
**These methods, claims and statements are based on the ideas, research and development of Jack Hancosky and the Hancosky Method.