Well, in a worse case senario, I can cast lead bullets, as I have about 25# of lead. I can make gunpowder, made it in high school. I can make gun cotton (early smokeless powder) if I can find some nitric acid. Brass will last about 10 rounds before it splits. Only problem is primers. I've heard you can take a primer, removed the anvil part with a very small screwdriver, use a flat punch to flatten out the firing pin dimple. Then reload the primer with the tips of three matches, carefully crushed into powder and pressed in the primer and replace the anvil. Never tried that, but it seems very time consuming just to make a primer. For hunting, one can used traditional black power with flint or a crossbow or long bow. Trapping and snaring is also a survival choice. Self defence is a whole nother matter. Can always buy a BP revolver or two, with a BP rifle. Also, they do make double BP rifles and shotguns. Right now shotgun shells can still be found as well as shotgun primers.