I though I had a pretty good grasp on this until I tried to put it into action today. My ballistic calc's (JBMballistics.com) say at 300 yards the bullet is dropping 16" and the mils is 1.5. So I'm thinking I should dial up 1.5 mils and I should be on target assuming all my data is correct. Does this sound right?

Rifle is an 18" bbl 223. Scope is a Vortex Viper PST 4-16 Mil/Mil. 75gn Hornady BTHP sitting 0.010 off the lands on top of 24.2 grains of BLC-2. 75 degree day at sea level.