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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/28/2010 at 19:05
andrews1958 View Drop Down
Optics GrassHopper
Optics GrassHopper


Joined: May/01/2009
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Points: 19
Can the first cross hair on a Leupold Boone and Crocket retical be sited in at 100 yards? All of the information I have seen shows it at 200 yards
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/02/2010 at 20:06
2 Samuel 22 View Drop Down
Optics Apprentice
Optics Apprentice
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Joined: January/08/2010
Location: USA
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Points: 59
Although you can zero the first cross hair (duplex intersection) for 100 yards, it throws off the lower aiming marks.  All of the literature I've read on the B&C reticle is that the first cross hair be zeroed at 200 or 300yds, depending on the gun cartridge.  This applies to the B&C, Varmint, LR, and LRV reticles.  The only Leupold BAS reticle that you can zero at 100yds and still use the lower aiming marks is the SA.B.R. which is intended for shotgun or muzzleloader use.

Leupold's BAS Manual can be found here:
https://www2.leupold.com/resources/downloads/BAS_Inst_Man_02Jun08.pdf
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/03/2010 at 02:43
8shots View Drop Down
Optics Jedi Knight
Optics Jedi Knight
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Joined: March/14/2007
Location: South Africa
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The BDC function works at a specified magnification only as it is a second focal plane reticule.
Allthough the manual says it should be on X magnification, you can find your own magnification that works for your rifle's ballistics.
 
As an example I have a 308Win at 2850 ft per sec (155gr) topped with the Leupold 8,5-25 with the varmint reticule. The very top or first cross is zeroed at 100yds. At 20x magnification, the next cross is dead on at 200yds and the next  down at 300yds. Should I change the magnification, this arrangement will not work.
 
So work the scope. Zero your top reticule. Play around with the magnification and see if you can find a "fit". Ypu need to know your exact trajectory by shooting at 100, 200 and 300yds and measuring the drop. Work this back to MOA. Then put up a 1 inch grid at 100yds and dial away. See at which magnification you get the best fit.
For example say you have 4inches drop at 200yds and 12 inches at 300 yds. That equals 2MOA and 4 MOA. So see at 100yds what puts you 2inches high and 4inches high.
 
Have fun...
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/03/2010 at 11:22
Shenko View Drop Down
Optics Apprentice
Optics Apprentice


Joined: April/20/2008
Location: WA
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Points: 247
It looks to me like a bullet with a ballistic coefficient of around .4, at a muzzle velocity of around 2700 fps, might fit quite well with that reticle at high magnification. Zeroed at 100 yards, the other aiming points should be pretty close at 200, 300, 350, and 400.

Like 8shots said, shoot it to know for sure.
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