Carlos Hathcock used a 30-06 Model 70 Winchester on at least one deployment to Nam. The Model 70 while being one of my and almost everyone's favorite rifles is not the most accurate. It was definitely acceptable because Hathcock made excellent use of it, much the same as Karamojo Bell made with the 7x57 Mauser on elephants. But for super accuracy, the Remington will beat the Model 70s sox off. IT is rigid, it has a super fast lock time, and it was designed by a Remington engineer that loved to shoot bench rest, Mike Walker, my name sake. The model 40 was the version of the Model 700 that was used by the US Military for sniping back in the late 60s and 70s and even today it is still used in some form. When it was first built, it was a bench rest favorite. It was the model 722 short action in 222 Remington caliber that made history as the bench rest champ of the 50s and 60s up into the 80s. Many bench guns were built off it. I believe for its time and even up to just recently it was the most accurate of all sniper rifles ever. Also, it was used in .308 caliber I believe, although some may have been built in 30-06 in the beginning.