Leupold Hunting Equipment Owner's Handbook Manual page 28

VX-7 BALLISTICS INDICATOR RING
Certain ballistics-compensation reticles such as the Boone and Crockett, and
Varmint Hunter's reticle may require tuning to achieve maximum precision with
multiple loads. The VX-7 ballistics indicator ring allows you to manually set
a reference point for your current trajectory. Once the proper magnification
setting has been determined (see Ballistics Aiming System instruction
supplement), the ballistics indicator ring can be aligned with the witness mark
on the eyepiece, allowing fast and accurate return to this setting in the field.
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