With full house loads I could never tell the difference between the 270 and 6.5x55 with similar bullet weights, regarding recoil and blast. Both will give you a headache if you shoot a lot of rounds.
Think a night of spotlighting and 100+ rounds fired from a vehicle.
In a Mauser or other long action rifle, while I'd not knock back a gift 6.5 I can't think of a reason to take one over a 270 Win.
Both good rounds, the 270 is just the big brother to the 6.5.
