I am new to the pendulum sight use. Am I correct in assuming that you zero it in on flat ground at 30 yards and then when in a stand it compensates for elevation anywhere inside 30 yards?

Am I way off base....what is the real deal and how do pendulum sights work at greater distances?...let's say...out to 50 yards.

I am no longer willing to die for my country...I am willing to die to protect my family from the country in which we reside.