I read somewhere - either on this or the Accuratereloading.com forum - that the felt recoil of the 7x64 Brenneke is less than that of the .30-06.
This post included a plausible-sounding technical explanation as to this. I think it had something to do with the bullet diameter and the acceleration of the bullet/powder burning rate. I cannot recollect what the explanation was but it seems illogical, indeed, when comparing the rounds only.
E.g. Norma lists the Oryx as follows:
7x64: 170grs (11,0g) - 840m/sec (2756 fps) for 3883 J (2868 ft-lb) of energy
.30-06: 180grs (11,7g) - 823m/sec (2700 fps) for 3964 J (2924 ft-lb) of energy

RWS
7x64: ID Klassik 11,5g - 840m/sec for 4128 J of energy (error: should be 4057 J)
.30-06: UNI Klassik 11,7g - 840m/sec for 4128 J of energy

With this similar figures, how big a difference can there be? Can anyone shed light on this?
Or can anyone present me with the theory as to why the recoil of the 7x64 would be noticeably less?

BTW - I have noticed a suprisingly big difference in recoil shooting the .308 v. the .30-06.
The figures of these are also a close match. Norma again:
.308: 180grs - 796m/sec (2612 fps) for 3708 J (2737 ft-lb) of energy
.30-06: 180grs - 823m/sec (2700 fps) for 3964 J (2924 ft-lb) of energy

The .30-06 has a more sharp and also a tad stronger recoil feeling than the .308.
I have never fired two identical rifles of only different caliber but I have shot plenty enough of both as they are the most common hunting calibers in Finland.
The only really similar feeling I've had is with Sako's Range ammo as they are both loaded 123grs @ 900m/sec (2953 fps).
I have one - note: but one! - friend who agrees with me on this.
The .308 while not perhaps outrigh comfortable is very manageable whereas the .30-06 is just nasty.

- Lars/Finland