You live in Seattle and you want civilization to end? What are you gonna eat? rats? I have an acre of vegetables and I also have livestock; not to mention fruit trees and fishing in my backyard. I will do just fine without civilization. You, on the otherhand, will die; most definitely.
I predict that roving bands of cannibalistic tweakers would quickly rise to the "top predator" level in your neck of the woods. Run when you hear the faint echoes of the techno remix of the "Deliverance" anthem whispering through the trees....
I think that the .223 might have something to say about that. I would just mount it to my bear stand and wait for em. I got enough rounds for every tweaker in WA. If you hippies get the munchies, you'd better find another garden to rob.