One shot is correct, I have my encore zeroed at 100yds with 250 sst, and 2 pellets of t7 accuracy is great 3/4 inch groups now when ijacked it up to 150 accuracy suffered! but i did dope my gun to 200yds and it was almost 13 inches differance (I dont have my sheet in front of me) but it was close! shoot your most accurate load then shot the gun at 200yds