You said you enjoyed the 270 win but how would you feel if the recoil was increased by 40%? Thats what you can expect from a 7mm rem mag in a comparable rifle! While the 7mm rem mag will shoot alittle flatter, it's real gain is in bullet selection for other then deer sized game.If deer or similar size gameare your primary concern I say stick with the 270, plenty flat enough to take deer at distances beyond mostshooters abilities.
Good Luck and Welcome