You would have to be really recoil sensitive to tell the difference in 308 and 270 recoil and it is more affected by bullet choice and stock fit than caliber. If you shoot 180's with the 308 it will probably kick more than the 270 with 130's. OTOH if you shoot 130's in the 308 and 150's in the 270, the 270 will kick a bit more although the difference is negligible. Shooting 150's in both, the 270 will kick a bit more because it is pushing the same weight bullet at a higher MV. Again, unless you have a really low recoil tolerance, I can't see it making much difference.
