I am rightly reminded by Jack and others that the final result of a long shot has another determining factor. When watching from behind the shooters at very long range targets, you can see the bullet wander in the wind as it goes.
The club puts out pennents at intervals along side the shooting lane to help judge the wind. It isn't unusual to see them disagree with each other, some blowing right, some blowing left, and some blowing back and forth. Wind can do this at Winnequah and your best planned shot can be literally, "gone with the wind".
I'm betting that long shots at unknown distances with unknown wind conditions are even tougher.
DD