I am considering purchasing a rifle for hunting Deer and Elk. I think I would like to go with a .308 rifle. As I've been looking a different guns many of the .308 are classified as varmint rifles. Does that mean that it shouldn't be used on big game? Or can it be used with light bullet on varmints and with a heavier bullet on Elk? I really like remington 700 VTR(varmint-tactical rifle). I would appreciate any information as to the limitations of a .308 varmint rifle.