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22
FUNCTIONS 15: SEVEN RIFLE
BALLISTIC GROUPS
TBR includes ballistic settings for seven
cartridge groups that were specifically
formulated for the three functions of TBR,
which are displayed as A, B, C, AB, AC, BC,
and ABC. For example, if your cartridge group
is in Group A, the reading in function 15 will tell
you what the distance is for holdover purposes, taking
into account the shot angle (see following chart). You must choose one of
the seven groups, based on your cartridge and ballistic information. Selecting a
new group deactivates all other groups. TBR performance groups organize load
performance in a way that provides generally 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 between the
selections provided, then that group is correct for your load.
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