Vortex Optics VIPER PST 1-4X24 RIFLESCOPE - Manual (Page 3)

RIFLESCO PE
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Using at Close Ranges
At short range distances inside of 25 yards, maximum performance
will come from using the PST 1–4x24 riflescope set down to lowest 1x
magnification and shooting with both eyes open using the heavy outer
circle and illuminated center crosshair dot to quickly center the target.
On most centerfire applications, actual point-of-impact will be just below
the crosshair intersection—typically 1–2 inches low from 0–25 yards.
Using at Intermediate Ranges
For distances of 50–175 yards, more magnification may be used if
desired and main crosshairs should still be used in a dead-on hold. On
most centerfire applications, point-of-impact will typically be .2 inches
below the crosshair intersection at 50 yards, dead on at 100 yards and
2.4 inches below crosshair intersection by 175 yards.