One or all of those. It basically depends on how much time I have to prep. If it's a bug out situation, it all depends on how much time I have to load up my vehicle and get the hell outta dodge. If it's a bug in situation, then I got it covered.
There was a unit in Alaska in WWII called Castner's Cutthroats. They were true SF units. They knew how to live off the land they knew how to hunt game and men... Take a look at their story and what their weapons they chose to carry in a deep survival situation. They were all back woodsmen and hunters before the army took them on.
7.62x39mm (for my MBR:main battle rifle)
9mm (for my side arm and back-up rifle, the 995)
7.62x54R ( for my Mosin, good bolt action for larger game for food and longer range shooting)
22LR (for small game hunting)
12 Gauge (for hunting and removing a threat at close range)
380ACP (for my back-up sidearm)
If I'm heading out to the wilderness to live off the land, I'd want a 22 rifle as a game-getter and my 357 for defense.
If we're talking Katrina-style SHTF, I'd want something concealable that I wouldn't mind losing to the tin-star authorities...say 38spl snubby.
If we're looking at total social collapse, with roving gangs of looters and general bad behavior, I'd want an AK in 762x39 and either a good 9mm or 1911 in 45 ACP on my hip. An AR in 223 wouldn't be a bad choice here either, just not my style.
Well, for Bug-In, I've got lead in different flavors:
For Bugout it'd be:
12GA, 9mm, & .22LR
Just not much use IMO for lugging around the Mosin. The 12 can bring down game at need and ammo's easier to scrounge. With 9mm and .22 I can feed the Beretta 92F, the HK P2000, the Kel-Tec Sub2K, the 995, the Henry .22 L/A, the .22 revolver, the Walther P22, and the 10/22. 8 guns (4 handgun/rifle pairs) to equip 4 people and only two calibers to worry about, easily available for scrounging.
Right now my personal stock calibers are
Now lets change the idea a tad. In a SHTF scenario what do you think you can get your hands on when things are drying up and you're out/low?
.223 < depends
^ There are other lesser ones, but those are the main ones. Why? They're common, and they're widely used in may firearms from many countries of orgin. If ammo is restricted to the public they are common enough to be scrounged from various sources.
In my neck of the woods the most common calibers for scrounging would be .22lr, 30-30, 30-06, .270, .38 Special, .357Mag, 9mm, .40S&W and .45ACP, the .308 is out there but not as popular as the others.
I have a number of sporting calibers as well, but if I had to grab and go and not knowing when I would be able to return to home base the SHTF calibers I listed in my orginal post is what we would take.