Since this is Long Range Hunting
Two guys reload and shoot at 700 yards and neither has a chronograph.
They both shoot 1/2 moa at 100 yards.
At 700 yards, under good conditions ( very subjective to a shooter), they start shooting and find that their groups are about 2 MOA.
The first guy has a new Chrony and notices that his velocities are erratic.
The other guy blames mirage, wind, and unseen thermals!
The guy with the chrony goes back to load development but the other guy just muddles along