Leupold RX Operating Instructions Manual page 16

Rx series
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NOTE:
Pressing "Set" continues to run through these settings until you press
"Mode" to move on.
NOTE:
Magnetic fields are constantly shifting on the Earth so declination angle
may need to be reset every couple of years for maximum accuracy.
FUNCTION 13: 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, 130 grain bullet at 3,050 feet
per second up a 30 degree incline at 400 yards, direct
line of sight, TBR output will be 364 yards. For this you
would hold 10 inches over the target, rather than 15 inches as you would hold
between your 300 and 400 yard marks. State-of-the-art processing algorithms
developed by the same engineers who developed Sierra Infinity
Ballistic Software and who developed ballistic algorithms for many space
vehicles over the last 40 years to determine the True Ballistic Range with
14
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