User guide

BDC
dead-holddead-hold
9
8
Th
e
D
ea
d
-Ho
ld
B
DC
retic
l
e incor
p
orates met
h
o
d
s for win
d
d
rift correction
a
n
d
ran
g
e estimation usin
g
t
h
e
h
as
h
mar
k
s on t
h
e
h
orizonta
l
cross
h
air.
A
s in usin
g
t
h
e
h
o
ld
over
h
as
h
mar
k
s, t
h
e ma
g
nification must
b
e set at t
h
e
h
i
gh
est ma
g
nification (18x for a 6–24x50 mo
d
e
l
)
.
C
orrectin
g
for win
d
d
rift is
d
one wit
h
t
h
e
h
as
h
mar
k
s on t
h
e
h
orizonta
l
cross
h
air.
Th
ese
h
as
h
mar
k
s are s
p
ace
d
at 2 M
OA
,
w
it
h
t
h
e insi
d
e en
d
s of t
h
e
h
eav
y
h
orizonta
l
cross
h
airs at 8 M
OA
from
center.
Sh
ooters fami
l
iar wit
h
t
h
e win
d
d
rift num
b
ers of
p
articu
l
ar ammunition
can use t
h
e
h
as
h
mar
k
spacin
g
to
h
e
l
p
estimate proper win
d
a
g
e
h
o
ld
-off once
t
h
e correct ran
g
e an
d
win
d
are
k
nown or estimate
d
.
U
se t
h
e on
l
ine Vortex
L
on
g
R
an
g
e Ba
ll
istic
C
a
l
cu
l
ator (
LR
B
C
) to
l
earn win
d
d
rift num
b
ers for
y
our
l
oa
d
s
.
R
an
g
in
g
d
istances is
d
one usin
g
t
h
e fo
ll
owin
g
simp
l
e formu
l
a
:
Using the Reticle for Wind Drift Compensation and Ranging
TARGET’S KNOWN WIDTH OR HEIGHT IN INCHES X 100
T
ARGET’S WIDTH OR HEIGHT IN MOAS MEASURED ON RETICLE
RANGE IN
YARDS
=
A
s
h
ooter can compare a tar
g
et o
bj
ect of
k
nown
d
imension (at s
h
ootin
g
d
istance) to eit
h
er t
h
e vertica
l
or
h
orizonta
l
h
as
h
mar
k
spacin
g
an
d
rou
ghl
y
estimate t
h
e ran
g
e.
R
emem
b
er,
h
as
h
mar
k
s on t
h
e vertica
l
cross
h
air are
sp
ace
d
at 1.5 M
OA
, 4.5 M
OA
an
d
7.5 M
OA
.
Th
e to
p
of t
h
e
b
ottom
vertica
l
h
eav
y
cross
h
air is 11 M
OA
from center. Horizonta
l
h
as
h
mar
k
s are
sp
ace
d
at 2 M
OA
s.
E
xam
pl
e:
R
an
g
in
g
a
C
o
y
ot
e
pggy
I
n
y
our
h
ome area,
y
ou
k
now t
h
at a co
y
ote runs a
b
out t
h
ree feet (36 inc
h
es)
i
n
l
en
g
t
h
. W
h
i
l
e out
h
untin
g
, you o
b
serve a coyote
a
n
d
ran
g
e
h
im wit
h
your scope set at t
h
e
h
i
gh
est
m
a
g
nification (18x for a 6–24x50 mo
d
e
l
).
Y
ou see
t
h
at t
h
e co
y
ote’s
b
o
dy
covers a
b
out t
h
e
d
istance
from t
h
e center cross
h
air to t
h
e e
dg
e of t
h
e
h
eavy
p
art of t
h
e
h
orizonta
l
cross
h
air (8 M
OA
).
U
sin
g
t
h
e
s
im
pl
e formu
l
a, you can estimate t
h
e coyotes
d
istance at 450 yar
d
s
.
450 YARDS
=
36 I
NCHES X 100
8 MOA MEASURED ON RETICLE
3600
8
=
E
xam
pl
e:
R
an
g
in
g
a
D
ee
r
pgg
Wh
en spottin
g
a
d
istant
b
uc
k
w
h
i
l
e
d
eer
h
untin
g
, you turn your scope to
t
h
e
h
i
gh
est ma
g
nification (18x for a 6–24x50 mo
d
e
l
)
a
n
d
ran
g
e
h
im. W
h
i
l
e
l
oo
k
in
g
t
h
rou
gh
t
h
e scope, you
s
ee t
h
at t
h
e
d
istance from t
h
e to
p
of
h
is
b
ac
k
to t
h
e
b
ottom of
h
is c
h
est (usua
ll
y a
b
out an 18-inc
h
d
e
p
t
h
o
n a mature
b
uc
k
) s
p
ans from t
h
e center cross
h
air to
t
h
e 2n
d
h
as
h
mar
k
d
own
(
4.5 M
OA)
on t
h
e retic
l
e.
U
sin
g
t
h
e formu
l
a, you can t
h
en estimate t
h
e
d
eer’s
d
istance at 400 yar
d
s.
400 YARDS
=
18 I
NCHES X 100
4.5 MOA MEASURED ON RETICLE
1800
4.5
=
Th
is formu
l
a
h
as
b
een simp
l
ifie
d
s
l
i
gh
t
l
y to a
ll
ow faster ca
l
cu
l
ations, an
d
y
ie
ld
s
d
istance estimates w
h
ic
h
are 5 percent
g
reater t
h
an actua
l
d
istance.
I
f you
d
esire more precise estimates, use t
h
e fo
ll
owin
g
formu
l
a
:
TARGET’S KNOWN WIDTH OR HEIGHT IN INCHES X 95.5
T
ARGET’S WIDTH OR HEIGHT IN MOAS MEASURED ON RETICLE
RANGE IN YARDS
=
manual_reticle_bdc-sfp-13a.indd 8-9anual_reticle_bdc-sfp-13a.indd 8-9 8/7/2013 7:31:07 AM8/7/2013 7:31:0