I was reading up on the history of the .308 Winchester cartridge and some material claims Winchester and the US army shortened the .30/06 to produce the 7.62Nato or .308Win in 1954 but other material says Savage shortened the .30/06 in 1921 to produce the .300Sav to "duplicate .30/06 in a shorter cartridge " and the US army was very interested in this cartridge as it met their requirement but Winchester wanted to lengthen the cartridge and produce a "Winchester" cartridge for obvious commercial gain . So is the .308Win/7.62Nato a .300Savage modified or a .30/06 modified?

Steve