But the real question is whether the difference is more theoretical than noticeable.
well, like others have said, with same bullet weight and velocity, i would say the differences would surely be too minimal to detect.
i havent fired a 270 in at least 25 years, but for some reason i was thinking that most of the ammo that you could get back then for it was in the 125-140 grain range, and most of the 06 ammo i remembered from back then was a little heavier, in which case you might could feel the difference.
the part about theoretical vs actual felt recoil is a good one.
im certain that if you were to give me one of each, with 100 rounds for each, of the same weight bullet, i could absolutely tell you which was the 06, and which was the 270, 100% of the time
(with a 50% margin of error)
this thread has reminded me of a funny story though. a family friend had an 06, and every single time he shot it, it knocked his hat off. he said it was irritating, but he loved the power and the effect it had on his game (mule deer and elk)
on his last hunting trip with that rifle, he fired, and of course, his hat flew off and out on some smaller branches near his tree stand. in an attempt to recover his hat he fell out of the tree, and his rifle went into a deep creek. he hurt his back in the fall and couldnt get the rifle, and barely made it to his truck.
it was a 5 hour drive back to his house, and was laid up for a couple of weeks. hes better now, and bought a remington 243 win. he said it kicks way less and his hat stays on.