I'm assuming you are tuning an F class setup. The guys here in Phoenix are testing loads from 600 all the way out to 1000 which is the same as I do with my .308 Palma rig.
At both distances look at the waterline height if wind conditions aren't the greatest. I'm very happy with sub moa vertical at 1k and when it is repeatable I consider development done. I'd prefer to wear out a barrel with a single load, but with current powder availability I am playing with 4 powders.
