I agree with DAA on this one. It's all about the primer pocket. I generally neck size only and to be honest I didn't mind leaving my brass a bit longer than I should. I don't mind a bit (a bit, not a lot) of a crush fit when using my bolt guns so my brass doesn't move much at all. USing this method I've had 223 cases that I got sick of reloading over and over again. Eventually I tossed them due to inconsistent primer pockets. But not long after that I found that the throat was burned in that gun beyond acceptable accuracy, essentialy the brass lasted the life of my barrel. I've fire formed about 250 rounds for my AI guns and I'm sure the brass will last the life of my barrels. .........
My Ruger single shots are a bit of a different story though. A crush fit is out of the question with a single shot, my thumb simply doesn't have the camming power of a bolt action. Full length resizing is a requirement, especially with the 223, it has a very tight chambern a small base die will barely resize cases enough to chamber a round.