y_not5

If'n it were me: and you are using a scope 7 100 grains of pellets - either Pyro or t7 ---

1/2" high @ 25 yards
1 1/2" high @ 100 yards

or if you choose about 2" high at 75 yards...

if all things are equal from there that will give you a pretty good point blank range to about 150 yards - BUT you rally need to shoot the ranges to be sure.