For those who use a one pin sight, at what distance do you "zero" it?

I was shooting today at 45-50 yards and I was about two-three inches low. I am going to shoot some more in the morning and bring it up some.

I am shooting right at 300fps, so what would you think the difference would be at 50yds if I zeroed it in at 20?

I have mine zeroed in at 30 yards or so. I have become efficient enough to hit where i need to hit between 5 yards and 40 yards.

I zeroed my HHA slider right in the middle of my effective shooting range... that way, it's got maximum "moveability" up and down inside the pin guard, and takes less movement to go in any one direction.