So far I have owned .308, 3006 and .270win in a 760 or 7600. All were pretty much the same with factory ammo honest 1.5-2" groups. My 270 win with handloads will do 1" with a couple of pet loads. Neither the 308 or 3006 ever saw handloads.
A friend picked up a light used one in a 35 whelan, his choice of factory load locally produced 2.5" groups on average. Worked up a partition load for him that betters this by more then 1". He's ave. between 1.25 and 1.5" with that load and is tickled. The moose he shoot last week not as thrilled!!