308 or 300 win mag.......Jesus they must be some pretty big deer. The 308 is one of those calibers where you say how does it work...huge bullet in a medium casing, whats funny is it has very promising down range characteristics...if you ever reload...that bullet has quite a few sweet spots. The magnum has a pretty good advantge in some ways, its an extremely fast shooter for its size category and its flight character cant really be rivaled but by a few calibers. You really dont need that much to kill a white tail......anything above a 7mm in my opinion is a compensation of power vs skill. Hell I seen a guy take out a monster 10 pointer @270 yrds full tilt with a 220 swift, but what do I know i'm just a squirrel trying to get a nut