Vortex Optics VIPER 2-7X32 - DEAD-HOLD BDC - Manual (Page 3)

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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. Visit www.vortexoptics.com for an on-line
Long Range Ballistic Calculator (LRBC) to compare your bullet drop
numbers to the ones listed for each class.
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 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 will only apply with the scope set at the highest
magnification. The main crosshair and its corresponding zero
distance can always be used at ANY magnification.
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Class B)
High Power Big Game and Magnum Rifle | Extended Ranges
(100–600 yards) Use 200 yard zero on main crosshair.
Bullet Drop
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 Drop
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 Drop
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