The 7mm rem mag headspacing on the belt applies to factory ammo ONLY. When you reload you set the sizing dies to headspace off the shoulder when neck resizing.
ORIGINAL: Uncle Mike
I was going to mention the 30-06 Horny Light Mag. 165gr SST with a muzzle Velocity of 3015 fpsout of a 24" tube slaps down the 7 mag 139gr, 154gr and 162grout to 200y and then looses face to the 139gr 7Mag.but only slightly.
The 30-06 Hornady Light Mags. are pretty bada$$. Not that you would neeeed all that!
Helmsman is right.. aint a spit of difference between the two.
IMHO I think the 7 Mag. is harder on barrels than the 30-06, given all physics equal.
And I like the shoulder headspacing of the 30-06 vs. the 'belt' of the 7 Mag. JMO- And I think the 30-06 is more versatile.