Out of the ones that you listed I would probably choose the .300 win mag. It's my understanding that on paper a lot of these calibers look similar, but the newer calibers are loaded to maximum pressures, whereas the win mag is an older cartridge that is kept to lower pressures in factory loads. If you reload and you have a new gun, there is room for improvement with this round. I know that it would be a different situation if I lived in a place where long shots are the norm, I'd have to make a point of practicing at long range. I've never had to worry about long shots and I know that I have no business shooting beyond 200 yards. Personally, if I needed a cartridge with more energy than my 30-06, I'd get a larger diameter cartridge.