If you go back to the late 60's early 70's Remington 700's started to get a reputation for excellent accuracy. That was largely due to the design of the 700 action. It is an inherently accurate design, more accurate than a Model 70 design in my opinion. The action was successfully used in Centerfire Benchrest until custom Benchrest actions became more abundant.
I am not saying you can't build an accurate rifle on a Model 70 action, but if you use the same quality of barrel and gun smithing to put them together, the 700 will still out shoot the Model 70. ... it's the action.