There is so little difference between the two it doesn't matter. If you reload you can make the 06 all but the same. A 7 Mag has higher pressures than the 06 at maximum loads If all else was equal and ran the same pressures in reloads the velocity would be the same with less powder burned too. A 30-06 doesn't get the nod for higher pressure cause of all the old guns out there and noone wants to run pressures to 54k... and if the .270 Win can do 54k so can the 06.