Make two diagrams.
1: Draw a line for your bore (bullet) and draw a line for your scope view (line of sight). Make them parallel.

2: Draw a line for your bore and draw a line for your scope with the back elevated (the line of sight will now cross the bore line).

Diagram 2 now shows that you bullet is shooting high (crosses your line of sight. To lower the strike of the bullet, you dial your scope DOWN.

This whole thing is to give you extra UP adjustment for long range shots.


Hope this helps.. rc