Here's a comparison of recoil energy for the cartridges that have been discussed in this thread:

Rifle Recoil Recoil
Weight Energy Velocity
.243 Win. (100 at 2960) 7.5 8.8 8.7
.25-06 Rem. (120 at 3000) 8.0 12.5 10.0
.270 Win. (130 at 3140) 8.0 16.5 n/a
.270 Win. (150 at 2900) 8.0 17.0 11.7
.280 Rem. (140 at 3000) 8.0 17.2 11.8
7mm-08 Rem. (140 at 2860) 8.0 12.6 10.1
7mm Rem. Mag. (150 at 3100) 8.5 19.2 12.1
.308 Win. (150 at 2800) 7.5 15.8 11.7
.30-06 Spfd. (150 at 2910) 8.0 17.6 11.9
.30-30 Win. (150 at 2400) 7.5 10.6 9.5
.300 Win. Mag. (180 at 2960) 8.5 25.9 14.0