Leupold VX-II - Manual (Page 26)

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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 tra-
jectory . 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 .