Land the first shot in the kill zone with certanty,then we all better quit hunting because that will never be achieavable.
Oh for goodness sakes no one is trying to say that you have to be perfect. Just the max rangeat whichyou are consistent. When the best of the best out there cannot consistently put their first shot in the vitals at 800 yards under field conditions then I think thats a strong indication that it's just too freaking far.
A 400 yard shot is the max I will try with my rifle,
And there you have your own answer. I'm sure there is a reason you have choosen 400 as your current maximum. Like perhaps it is the max distance at which you are "CONSISTENT".