What I said before, stands. Why do you think that you are going to be needing a truckload of ammunition? why do you believe that you will be the survivor? Why do you believe that your best chance of staying alive is to have a boatload of .22 lr, as opposed to a single firearm and 200 - 400 rounds of highly effective ammo? forget the 223 if you choose. Go with buckshot, .308, .243, even 30-30. The important parts of survival are twofold.
First, you gotta live. in a gunfight, that means winning it. your chances of winning a gunfight against an armed opponent will go up exponentially if you abandon the thought of using a .22 lr. move up to something certain to blow a pile of internal organs big enough to feed three coyotes out of a bad guy with only a single hit.
It's hard to predict what course civil unrest will take. The one thing that is certain is that it may not take the form of massive riots and occupation by huge lots of armed men.
I own several rifles, pistols, shotguns, and among them, the only one missing is a dedicated semiauto combat rifle. Being that case, and my personal situation, I don't feel handicapped, even if i'm up against a handful of punks.
I'd like to point something out. I know a lot of people who take preparedness seriously, and if push comes to shove, I would rather defend a plot of land with these people than stand alone in my own home. Funny thing is, that these people feel the same about me, even though I don't have a laser sighted firepower machine.
Here are some things that will bring you through civil unrest.
Excellent skills
tactical training
planning
improvisation
flexibility in face of failure
a mindset tuned to the demands of combat