Long Range Shooting Primer; Intro - 5.11 Tactical SURESHOT HRT Manual

LONG RANGE PRIMER
If you are an experienced rifle shooter, please skip to the next
segment, titled "SURESHOT INTRO." If you are new to long range
®
shooting please read on. This is intended as a simple primer to help
you understand the Horus Vision software. It is not a replacement for
training and the safe handling of firearms.
In order for the 5.11 HRT watch to calculate your bullet's trajectory
®
correctly, the software needs to know some specifics about your
scope, rifle and cartridge. This segment will briefly explain how and
why these specifics affect your bullet's trajectory.
Temperature: As air temperature increases, air density decreases. And
as air density decreases it offers less resistance against your bullet's
flight which can affect the bullet's point of impact. The Temperature
you input into the watch should be accurate within 10 or 15 degrees to
the conditions in which you will be shooting.
Bore Height: (Also called scope height) is the distance between the
center of your bore and the center of your scope. It is expressed as
inches and tenths, eg. 1.7 inches. It is not the height of your rings.
Your scope should be mounted as low as possible to the barrel, but
not touching. If you are interested in extremely long ranges (past 600
yards) you may also require a canted scope base.
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