Did you take the action out of the stock before you declared "no more markings"? There should be a number of proof marks on both the receiver and the barrel, including date stamps. That would also answer the question if you have a gun original to the 270 Win caliber or something rebarreled after the war.
I used to love being able to hit hard at 1000 yards. As I get older I find hitting a mini ram at 200 yards with the 22 oddly more satisfying.