I have owned 2 rifles in 308,currently still own a 30-06,and a 243. both are Remington bolt actions. the 270 is a necked down 30 -06 case and the 243 is a necked down 308 case. the 270 and 30-06 is a long action and the 243 and 308 are short actions. off the top of my head 12mm shorter! i have hunted deer in wis. since 1964 and my first rifle was a 308,second was a 308, the 30-06 now I've owned since 1971. 30-06 is more versatile in store bought ammo selection, 308 ballistically very close to the 30-06 but has the shorter action and not as many ammo choices. 270 smaller bullet dia. not as many ammo choices. and bullet weights not as heavy. i don't think you could go wrong with 30-06, 308, or 270. especially if you have the means to load your own shells.