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Check GunBroker.com for SWFA's No Reserve and No Minimum bid firearm auctions. 
Leupold BDC on Mark 4 
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Urimaginaryfrnd
MODERATOR Resident Redneck Joined: June/20/2005 Location: Iowa Status: Offline Points: 13920 
These scopes have about 90 moa of internal adjustment windage and elevation usually about half above and half below unless you use a plus moa base from Badger Ordnance.
example 168 gr Sierra matchking balistic coeffecient at 2650 ft per sec is .462
http://www.blackhills.com/rfactorynew.htm the .308 BH is a 168 SMK at 2650 fps.
From what I understand so far you have the M2 (short) knobs that have built in balistic compensation. M2 knobs are 1/2 minute of angle per click where the M1 knobs are 1/4 minute of angle per click. At 100 yds one minute of angle is essentially one inch at two hundred yards one minute of angle is essentially 2 inches and so on one minute of angle 300 yds is 3 inches, 400 yds one minute of angle is 4 inches. So if you sight in at 100 yds ZERO and you are using 1/2 moa per click here is your chart, just remember that that 1/2 inch at a hundred is not 1/2 inch at 400 it is 1/2 moa or 2 inches think of it as parts of a circle the farther out you go the bigger the piece of the pie. If you want custom knobs for different weight bullets order from Kenton Ind. the link is above.
Advanced Ballistics Calculator 
