I've just answered this for the fourth time in three days, so I might as well inflict it on all of you. I've owned numerous .270s (including a .270 Weatherby and a .270 WSM, neither of which are included here) and .30/06s. I've shot more '06 ammo than any other caliber because a lot of my shooting is gun testing, and the '06 is our most popular cartridge, so it makes sense to get guns in that caliber. Of all my rifles, the one with the most ammo up its spout is a Kenny Jarrett .30/06 built on a Model 700 action. The rifling is scorched about a third of the way up the barrel.