I just picked up a Savage Model 11 in a .308 caliber. it has a vortex diamonback 3-9x40 scope on it already, with the BDC recticle (bullet drop compensation?) anyone know what the little dots are "calibrated" to? is there a standard to zero your scope to? I'd like to use this for some target shooting at 400 yards primarily, with the option of getting into deer hunting. so, 100 yard zero? 200 yard zero? would a 200 yard zero shoot "flatter"? (a little low at 100 yards, and a little low at 300 yards?) fyi, this is my first long range firearm with magnification/scope. I want to push myself with some long range shooting. I can already shoot an 18" disc at 400 yards with iron sights on my AR...haven't tried anything longer distances yet, but I'd like to some day be able to say that I can make a 1000 yard shot haha!