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The desired sighting in distance (SID) for the basic
reticle (central aiming point) is freely selectable. All
other distance information below this for the cor-
responding bars and dots is based on this basic
setting. In our example, the weapon is sighted in at
200 m.
Using the data input from this example you will
obtain the following distance information for the BRX
reticle:
200
266
318
366
409
446
482
514
543
572
Using the Wind Bars:
It is diffi cult if not impossible to measure the wind, at
least not over the entire trajectory of the bullet. Thus
there is a need here for empirical values that make
using the wind bars a practical additional benefi t.
To make handling easier out in the open, we have
three different categories for overcoming side wind –
assuming that this wind is acting at 90 degrees to the
bullet's trajectory.
The basis for this categorisation is your BC (ballistic
coeffi cient: the characteristic fi gure showing how well
a bullet can overcome the air resistance; you will
fi nd the BC value either in our ballistics programme
or in the relevant manufacturer's shooting tables,
on average it lies between 0.2 and 0.6 for hunting
weapons).
10
Values required for the
ballistics programme:
Weight of
bullet:
10.7 g
Type of
bullet BC:
0.293
Sighting
height:
5.0 cm
Vo:
940 m/s
DE
EN
The following table provides reference values for
using the wind bars. The data refers to a 90 degree
side wind.
1
st
wind aiming point 2
1
st
category: BC ~ 0.45
16 km/h
nd
2
category: BC ~ 0.35
12 km/h
rd
3
category: BC ~ 0.25
Take the wind aiming points arranged on the right-
hand side if the wind is coming from the left. Take the
wind aiming points arranged on the left-hand side if
the wind is coming from the right.
Example
Side wind at 90 degrees
to the trajectory,
st
1
wind aiming point
Note:
As the reticle is in the second image plane, the data
determined is only valid at the highest magnifi cation!
You do, however, have the opportunity to determine
each of the aiming points at the appropriate magni-
fi cation setting with the help of the ballistics pro-
gramme. The basic distance (central aiming point)
you have determined is not affected by this; it always
remains the same regardless of the magnifi cation
setting.
Practical Tip:
You will find five empty labels in the operating in-
structions. Write down the personal aiming points
you have calculated on them and stick them on the
weapon or the rifle scope. If used in combination with
a range finder, you will then be "quick on target".
11
nd
wind aiming point
32 km/h
24 km/h
8 km/h
16 km/h
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