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Old January 3, 2013, 08:53 PM   #16
Bart B.
Senior Member
 
Join Date: February 15, 2009
Posts: 4,799
Wherever the BDC thing (reticule or knob) is, it's only good for one muzzle velocity, one altitude, one set of atmospheric conditions and one bullet. Altitude and atmospheric conditions not being right can easily cause a 5 foot elevation error in shot impact at 1000 yards.
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