The difference between the 300 Mag and the 30-06 is about 80-100 yards. The Energy and Velocity of the 30-06 is about the same as the 300 Win Mag at 80-100 yards shorter range.
100 yardsis about right if both are loaded to SAAMI specs.The 300ultra mag will add about the same over the 300winmag.So the 300 ultramag adds in the neighbourhood of 200 yards over the 30-06.The energy and velocity will be as much with the 300ultramagat 300 yards as with the 30-06 at 100 yards.