As a .280 Remington user, I can state with conviction that those ten extra grains and .007 of an inch represent the tipping point at which rifles become effective. None of the game I killed could ever have been harvested with the puny .270 Winchester.....it's ludicrous to even entertain the thought!
I do have a serious question....though I have read frequently in O'Connor's writing that the .270 was a great cartridge (as was the 7X57, .280 Rem, .257 Roberts, .30-06, .300 and .375 H&H and several others) I have never found a quote where he said unequivocally that it was the best rifle for North American game. Can someone help me out?