.308 or a .223, depending on what range you plan to shoot at. there is no reason to go to something less common if it is your only firearm.
do you wear weird colored clothes and spike your hair, as well as adorn yourself with all kinds of weird piercings just to be different? There is a reason those common calibres are so prolific. 6.5x55 looks pretty apealling, anyways. the rest would really not make much sense for someone who just likes to shoot.



























