ORIGINAL: bigbulls
Assuming the 7mm Rem mag is what you have it would be the more powerful of the two. It has starts out faster, retains more velocity and has more energy to all ranges than the 30-06 does with any given weight bullet.
Take a look at these 06 loads and you may reevaluate the 7mm / 06 comparison
Weight Velocity KE
1653015 3330
180 2900 3361