I do not get where everyone thinks that 308 brass is so much cheaper than 7-08 brass. Presently, there is only $5 difference between the cost of new 308 ($40) and new 7-08 ($45) brass per hundred. Unless you have 308 brass that is new given to you (lucky you) or you have known once fired brass for free or extremely cheap, I just do not get it. Why save $5 (5 cents per piece) and end up with a head stamp that is not correct, the hassle of full length sizing and shorter case life. I do not full length size new brass, because it just works the brass once more than it needs to be. I definitely would not use brass of unknown origin or unknown number of firings. I always just neck size brass as much as possible and consider the first firing to a forming load so full length sizing just squeezes it down once more. But that is me, you are always free to do what ever you want. Good Shooting and Good Luck