I know alot love their .223 AR's but Im one that believe's that the 6.8 SPC is superior.Even at home defense ranges which one would cause the most tissue damage.I vote for the 6.8 SPC 2 rifle.The problem is what manufacturer.Their's Daniel Defense,Stag Arms,Rock River,DPMS,Ruger Mini,The 68 Forum's,Barrett.I know the 6.8 SPC ammo is expensive but I would rather own the harder hitting 6.8 round.I have handled .308's and .338's but the weight of the 6.8 SPC is not that bad.I have shot 2 6.8 SPC 2 rifle's and liked them very much.Im in the camp that the 6.8 SPC would be an all arounf effective stopper than any and all rages compared to the .223.Anyone have a 6.8 that has it has a SHTF Rifle?? Thanks 