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Once the rifle's clamped in solid with the scope on something down range, just change the power and see if the reticule moves around in the target area. You don't need to twist the E and W knobs or even the range focus one. The reticule typically moves in a figure 8 pattern or sometimes the letter C or S patterns. It all depends on the mechanics of the two lens group barrels sliding back and forth at the back end of the scope right in front of the eyepiece. This is for rear focal plane scopes.
Front focal plane scopes can change reticule position on target if the objective lens' group moves irregularly when it focuses for range.
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