Oh gee, everyone knows Jack O Connor invented the .270 in hunting camp one night when Elmer Keith was late arriving.
And I always thought that JO'C did it to pi$$ EK off, to prove to him that a man didn't need a rifle of at least 35 caliber and bullets weighing at least 250 grains to kill North American game. I don't know that I ever read that EK ever used a 270, but he did claim to have owned a 256 Newton and other than being about 150+/- fps slower and having a bore diameter 0.013" smaller, there isn't a whole lot of "practical" difference between the two.
