FUNCTION 1: TRUE BALLISTIC RANGE
™
TBR calculates the equivalent horizontal
range (level fire range) from which
you can determine the correct aim
for the conditions. For example,
if you are shooting a .270 caliber,
130 grain (8.4 grams) bullet at 3,050 feet
(930 meters) per second up a 30° incline at 400 yards (366 meters),
direct line of sight, the TBR output will be 364 yards (333 meters).
State-of-the-art processing algorithms, developed by the same
engineers who developed Sierra Infinity
©
Exterior Ballistics Software
and who developed ballistics algorithms for many space vehicles
over the last 40 years, determine the True Ballistic Range with
incredible accuracy, eliminating potential errors that could cause
you to miscalculate your aiming point. The first step in correctly
using TBR is to Practice, Practice, Practice. Anytime you handle a
firearm or bow, you are ultimately responsible for your projectile.
The inclinometer output is shown in the lower portion of the display,
just right of the battery power status indicator.
For rifle users, adjustment or holdover
information can also be displayed. The
available settings are as follows: MOA
displays the minute of angle correction,
HOLD displays the inches or centimeters
to holdover the intended point of impact,
and BAS outputs the equivalent range to
use with Leupold’s Ballistics Aiming System
™
reticles or equivalent
horizontal range. TBR for rifle settings is effective to 800 yards
(732 meters) for most cartridges.
BAS (displayed as bAS) displays the equivalent
horizontal range. This is the range you
will want to use when shooting, rather
than the line of sight distance, which
may contain gross errors depending
upon the shot angle. Returns will be
displayed with equivalent horizontal range.
HOLD (displayed as HOLd) will display your
holdover for that target at that distance,
which is based upon the ballistics group
and sight-in distance you will choose in
a later mode. The upper digits display
holdover in inches if yards is the chosen
measurement output. Centimeters will
be displayed if meters is chosen for your
measurement output. Your hold will be
shown as “HI 999” or “LO 999”.
MOA Mode will show the minute of
angle adjustment for your target,
accounting for the True Ballistic Range.
The upper display will show MOA
adjustment as “UP 999” and “dn 999”.
SEVEN RIFLE BALLISTICS GROUPS
TBR includes ballistics settings for seven
cartridge groups 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 return in Function 1
will account for the shot angle and provide the proper distance for
holdover purposes (see Cartridge Table on page 4). 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 (6.35 centimeters)
(1/2 minute of angle) of error in aiming out to 500 yards (457 meters).
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 mode with full confidence.
Operation
When you initially push and hold the POWER button, for more
than one (1) second, the unit is ready for scanning. Pressing and
releasing the MODE button begins navigation of the menu.
To set or activate a function, you must advance the mode selector
by pressing the MODE button until that function is flashing. To
activate or deactivate that function, press the POWER button.
When a function is activated, the icon and the word “ON” will be
displayed. When a function is deactivated, the icon will disappear
and the word “OFF” will be displayed. Repeatedly pressing the
POWER button will repeatedly toggle that function ON/OFF.
TOP VIEW
POWER
MODE
FOCUS
For rifle users, TBR mode is comprised of three functions: Hold,
MOA, and BAS. One of these modes must be selected. To select
the desired function, activate TBR, then proceed through the
menu (by pressing the MODE button), past the BOW and Compass
functions, until the appropriate TBR function is flashing; use the
POWER button to activate the appropriate TBR function.
For information regarding BOW settings, please see
page 5.
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