Leupold Hunting Equipment Owner's Handbook Manual page 17

THE FINAL STEP: THREE-SHOT GROUPS
Whichever bore-sighting method you've used, the next steps are the same on
the firing range. To ensure reliable results, always fire from a rested position
when performing these steps. (If you are using an adjustable objective or side
focus model scope, perform any correction for parallax before continuing, as
explained in "Understanding Parallax" on pages 24-27.)
1. Fire a shot or two.
2. If you are several inches off center, make an appropriate amount of
adjustment to move the reticle to the center of the target.
3. Carefully fire a three-shot group.
4. Use the center of that group as a reference point for the final
adjustments to windage and elevation.
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