I have used both, with the 270 being my primary deer rifle for 30 years. I have had only one 270, a Remington 700 Classic. I owned 3 different 6.5X55's, 2 Howas and a customized Swedish Mauser. Shooting reloads only, my 270 outshoot all of them, which is the reason I no longer have a 6.5X55, as I just prefer the 270. Nothing wrong with the Swede, and I've given thought to trying another one some day.