Past and 'at' your 'initial zero'...lets say 15yds, your pellet will be above your crosshairs at 30'.
Any closer and you will be below your cross hairs but not by the amount you would normally give the target.
IE a 9 yarder for me is normally 11/2 mildots lets say but at 30' it is 1 mildot.
So a 30 yd target (my zero) at 30' will see me hitting maybe 20-25mm high. (all from memory)
Don't even try it with a boinger....
...just joking but it is harder.