Leupold RX-1000i, Operation Manual

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FUNCTION 2: SEVEN RIFLE BALLISTICS GROUPS
(RX-1000 i TBR MODELS ONLY)
TBR includes ballistics settings for seven cartridge groups which are displayed as
A, B, C, AB, AC, BC, and ABC, specifically formulated for the four functions of
TBR. For example, if your cartridge type is in Group A, the displayed reading
will account for the shot angle and provide the proper distance for holdover
purposes (see following chart). You must choose one of the seven groups, based
on your cartridge and ballistics information. TBR performance groups organize
load performance in a way that generally provides less than 2.5 inches (1/2
minute of angle) of error in aiming out to 500 yards. The cartridge table shows
a common assortment of factory loads organized in their TBR performance
groups. If you are shooting a similar bullet weight and muzzle velocity that
falls into the provided selections, you can use that cartridge group with full
confidence.