I have the Simmons Pro Hunter zeroed in perfectly at 50 yards, and if I dial in the AO to 100 yards, I'll still be dead on the money. The scope can dial all the way out to 300 yards of AO, but I don't even think of trying anything that far out with a 30-30!
The Adjustbale Objective doesn't do anything for the point of impact, The adjustable objective is another way of saying cheapy parallax adjustment. Just felt i should correct you to save you from any future embarisment.