From 2 yards away I would say you want to be calling your shots for sure. Anything 1 yard and under I don't get a clean sight picture if its a normal height open target. Just by holding my gun up to the center of the target I can usually hit alphas at speed since at that range the A zone is going to be huge. This isn't usually a 100% conscious choice though its more of an instinctive reaction while under the clock. Now if its a low target, through a port, at an angle, etc basically anything that isn't a normal height straight on open target then I get a clean sight picture every time the fractions of a second you'll save will be completely negated if you end up dropping 2 deltas or worse mikes on an easy target.