[Unclenick]

It's an easy calculation. Divide the distance between sights (the sight radius) by the distance to the target with both in the same units (inches, feet , yards, millimeters, whatever), and multiply the result by the the change in elevation you want. That gives you the change in sight height.

Example: Suppose your sight radius is 20 inches and your range is 3600 inches (100 yards). Divide 20 by 3600 to get 0.00555... you want to bring point of impact down 18 inches, so multiply 18 inches by 0.00555... to get 0.1 inches. So you have to raise the front sight 0.1 inches.

If you are going to hunt with this rifle, you might consider Jeff Cooper's advice to sight it to average 2" high at 100 yards. That will keep you within minute of deer to past 200 yards without adjusting the sights.

BTW, when you are looking for your point of impact, don't shoot small groups, as the center moves around some from one small group to the next. The statisticians will tell you that you need 30 to get a good average location of your bullet holes. But try use 10 at least.