Well, I guess I should have used the term "safer" place to hide out. Maybe your home is safer than say the next town over. Maybe it is your cabin in the woods, or maybe it is on your yacht in the middle of the carribean. IDK.
I'll agree with you on the need for more ammo than what you would expect.
But I'll leave you with this question. How long you think the average gunfight is going to last between two survivalist? Weather it be a group or mano e mano fight?
I'll guess this. If you have "invaders" trying to take your stuff and the bullets start flying, most will probably retreat. Maybe if they too have guns, they will let off some covering fire for their retreat. Most people are not ready to risk their lives and will go off to find "easier" pickings.
Now, the scenerio where they come in and don't flee after the inital shots- well their either hell bent on killing you or crazy and I don't really want to meet either of those people. In that cse, you are right. Mass supressive fire and lots of ammo.

Hemi