For me it was the 700 5R 308 with Federal GMM 168 grain ammo. It would shoot any where from .25-.5 MOA all day every day. I cant really say that this was 'hunting' ammo but it worked at the time.
The other that stands out in my mind is a 700 VSSF in 308 that I sold. I had never ran factory ammo in it but when the buyer bought it he ran 150 Remington core-lokt ammo in it and put 5 rounds in a hole the size of a dime at 100 yards. Surgical scary.