Was cruising the internet and came upon a very informative program. It is a free download that I know I will use and that many on this forum can us. It is a ballistic program that you can use to help sight your scope in. I just used the MAP 6 reticle since it had less lines in it on the graph. You enter your starting MV, the ED(Ballistic Coeficient) of the pellet(it will even calculate this for you), the height of your scope above the bore, your zero range, and the magnification of your scope. You can change your Zero range and it shows graphically the trajectory of your pellet. You can figure hold over and hold under from the graph. Or if you prefer, you can figure the clicks required to readjust your POI to any yardage. You can also change the ED for the various pellets in your arsenal. If you have a .177 or/and a .22, you can just change screens and plot for each. The program is from Hawke Optics and is called the Hawke Ballistic Reticle Calculator(V1.0.3). This program can be downloaded at
http://www.hawkeoptics.com/brc/index.htm. Hope this can be of help to some other shooters.