You dont own any firearms?
My problem is, I have more 223 and 7.62x39 stockpiled then I do 308.
oh, was this more of a 'what part of your arsenal would you strap to your back?' type thing? 'cause my first thought in the case of like, worldwide anarchy (e.g. zombpocalypse), i would just raid the nearest sporting goods store as a first line of defense. plenty of shotguns, rifles, and ammo, and many places around here have handguns. gun stores would be less of a target since i'd probably have to have a torch or something (i've seen, very, very few without very sturdy barred doors and windows, for obvious reasons).
and no, i do not own real firearms. i or someone else would already be dead. i do have military training and still enjoy shooting them occasionally, though. just not armed for possible mass hysteria. not worried so much about a break-in or something- either it'll be a pro who robs and/or kills me in my sleep, or it'll be some crackhead who gets scared off by the angry naked man chasing him with a board with a nail in it.
edit- also i dont see much purpose for .30[06] or .308 in this situation. fun round to shoot, but too much kick to want to have to defend yourself with it. .223 will get the same results if you shoot center mass (either death or incapacitation). hell, like i said, even tiny 'ol .22LR is still going to be a hell of a lot better than nothing.