Wow, very good information guys, thx for all of your help. I do not have access to a good 300-500 hundred yd range but my friend does. I usually full length resize because I have several different 308s, I do use ball powder sometimes and I have had good luck with it and I try to let my barrel cool down between shots.
One last question, how important is neck tension? I never crimp my rifle ammo because I don't shoot semi autos and nobody I have asked can tell me if it works or not.
Thx for all the replies.