Vortex Optics VIPER HS 4-16X44 LR RIFLESCOPE - Manual (Page 3)

BDC dead-hold dead-hold
5 4
R
IFLESCOPE
A
DJUSTMENTS
Using the Reticle for Bullet Drop Compensation
Rifle/ammo combinations are put into ballistic classes where bullet drops
will be predictable within 2–4 inches (there will still be a slight variation
between individual rifle and load ballistics and the Dead-Hold reticle).
Begin by choosing one of the listed Firearm/Range classes. If your firearm/
range doesn’t fall exactly into one of these classes, select the class which
is most similar. [Use the Vortex on-line Long Range Ballistic Calculator
(LRBC) to compare your bullet drop numbers to the ones listed for each
class—available at www.vortexoptics.com.]
After selecting a class, sight in the main crosshair to the recommended
zero range for that class. (Consult the main riflescope owner’s manual
for information on sighting in the main crosshair.) Once the rifle has
been sighted in, the lower hashmarks can then be used as aiming points
at the corresponding distances listed. For most popular rifles and loads,
the hashmarks will provide accuracy within 0–4 inches of your aiming
point (depending on the range). If you require greater accuracy from the
Dead-Hold BDC reticle, use the Precision Technique detailed in the
next section.
Each of these classes will use a different corresponding range to each
crosshair hashmark depending on ballistic performance. Remember
that the listed ranges are accurate with the scope set at the highest
magnification (18x for a 6–24x50 model). The main crosshair and its
corresponding zero distance can be used at any magnification.
S
TANDARD
T
ECHNIQUE
Class B
High Power Big Game and Magnum Rifle | Extended Ranges
(100–600 yards) Use 200 yard zero on main crosshair.
Bullet Dropp
1st Hashmark: 300 yards | 4.5-inch drop
2nd Hashmark: 400 yards | 18-inch drop
3rd Hashmark: 500 yards | 37.5-inch drop
Top of Bottom Post: 600 yards | 66-inch drop
Class C)
High Velocity, Small Caliber Varmint Rifle | Extended Ranges
(100–600 yards) Use 200 yard zero on main crosshair.
Bullet Dropp
1st Hashmark: 300 yards | 4.5-inch drop
2nd Hashmark: 450 yards | 18-inch drop
3rd Hashmark: 550 yards | 37.5-inch drop
Top of Bottom Post: 650 yards | 66-inch drop
Class A
High Power Big Game Rifle | Moderate Ranges
(100–400 yards) Use 100 yard zero on main crosshair.
Bullet Dropp
1st Hashmark: 200 yards | 3-inch drop
2nd Hashmark: 300 yards | 13.5-inch drop
3rd Hashmark: 400 yards | 30-inch drop
Top of Bottom Post: 500 yards | 55-inch drop
manual_reticle_bdc-sfp-13a.indd 4-5 anual_reticle_bdc-sfp-13a.indd 4-5 8/7/2013 7:31:06 AM 8/7/2013 7:31:0