I have never seen a pre-64 model 70 Winchester, in VG condition, in a deer caliber, that would not shoot factory ammo into 1.5 inch groups at 100 yards, either as is, or with a small amount of adjustment. This is way more than accurate for hunting deer and other large game.
Finn Aagard's favorite hunting rifle, that he shot more big game with than any other rifle, was an early 1950s FN commercial mauser, with a stepped down military barrel, in .30-06. He bragged that it would only group 2 inches from a bench on a good day. He was more interested in hunting than the science of getting small groups.
Regards,
Mannyrock