If I was setting up a scope for a rifle and I used a laser boresight, it would help my windage, no doubt, but what about ballistics? For example if I have a 300 win mag and I use a laser boresight to 200 yds. The bore sight tells me where the barrel/bullet is pointing and if I line my crosshairs up with it, the bullet should hit low because we have not yet accounted for gravity. Thus I would need to have my crosshairs about 8" below the laser dot at 200yds given the speed of a 165gr Win mag.

Am I off in thinking this way? (and I know it is best to actually shoot to sight in, but I am just looking for insight on this particular subject)