R_H_Clark,
Like Mule Deer I used the plex in a 4-12X for both ranging and sighting at longer range in the last '70's. I practiced with it by knowing where the bottom post in inches was from the center on different magnification settings.
Recently for a while I had a z5 with the ballistic turret it was a blast to play with and learn to use it. Once you get it you got it! Enjoy.
