Having shot on the same day, two 9 pound Garands, one a .30-06 and the other a 7.62 NATO, 50 times each, standing, sitting and prone, no significant difference in felt recoil. In spite of these differences shooting 172-gr. match loads from each:
7.62
Recoil Impulse in (lbs sec),.............2.69
Velocity of recoiling firearm (fps).....9.63
Free recoil energy in (ft/lbs)..........12.96
.30-06
Recoil Impulse in (lbs sec)..............2.87
Velocity of recoiling firearm (fps)...10.26
Free recoil energy in (ft/lbs)..........14.70
The .30-06 was a little louder.
Here's a 9 pound .300 Win Mag shooting out a 172 at 3100 over 71 grains of powder:
.300 Win Mag
Recoil Impulse in (lbs sec)..............3.63
Velocity of recoiling firearm (fps)...12.97
Free recoil energy in (ft/lbs)..........23.51