RE: which is more powerful?
The best available 30-06 factory ammogenerates 3361FT/LBS of Kinetic Energy at the muzzle this actually exceeds the available ammo from any 7 MM Remmington Mag factory load I have ever seen. Actually there are 7 different factory loads that have 3300 or more FT/LBS of KE from the 06. These are "High Energy" loads with higher energy powders that operate best in 308 and 30-06 cartridges. The 7MM was always on top but with these recent cartridges the 99 year old 06 is currently in front.
PS: The 06 is also shooting heavier bullets with these HE loads than the 7MM and the LBS of Momentum is where the 06really has the edge.