I am trying to decide what I want to get. I want to start practicing to extend my range for whitetail hunting. 99% of my shots will be under 400 yds, but I would like the cartridge to be capable of a 500 yd clean kill if I put in the range time to do so. I do not handload right now, I wont be able too for a couple more years so I am stuck with factory loads right now, so I want to choose a caliber is has alot of factory choices. I am looking at .270 Win, 30/06, and .308 Win. For under 500 yds, would the .308 have the power to cleanly kill large whitetails? Our mature bucks run 175-200 normally, but a 250lb deer is not that strange. Will the .270 or 30/06 do anything under 500 yds that the .308 wont do?