IMHO, a tougher bullet is not what you want past 300 yards with the .270 Win. At the lower velocity threshold, most tough premium bullets don't expand much. A plain old fashioned 130 grain Nosler Ballistic Tip launched with a muzzle velocity of ~3,000 fps is smackin' deadly on deer out to well beyond 500 yards if the shooter is up to the task. At distance, it performs more like a conventional soft point does at closer ranges. IMO, this is the optimum .270 Win projectile for taking deer at long range.
Mike