Those that plan to shoot 1000 rounds of ammo in self defense - what are you going to do with all the bodies? Let's say that they are extra tough and you can't shoot really well so 5 rounds per dead body gives you 200 dead neighbors stacked around your "bug in location" aka suburban stick-built heavily morgaged Cape Cod house. If you have 100 feet of frontage on your nice quiet street you should be able to stack the deceased four-high out by the sidewalk for the length of your property which should provide you some protection from incoming gunfire.
That's case one of your stash. Obviously you should stockpile one case per side to fortify your house with corpses and leave another case for additional defense. Five cases. That's the magic SHTF number. Period.
You should probably pack an additional sixer of Mountain Dew and two to three bags of Funions for provisions, and maybe an extra set of AA batteries for your discman.
pre-dug hole and lots of lime