The world's (and the United States') current population and population distribution cannot be supported by a hunting/gathering lifestyle.

If a disaster of sufficient magnitute were to occur that disabled our current agricultural and distribution system, there would be unsustainable hunting -- we would rapidly overhunt game animals leading to their virtual or actual extinction. This would happen much more quickly than most of us will deplete our ammunition supplies. Here's a way to visualize what will happen should such a disater ever occur -- imagine a floor map of the United States. Place a tube filled with 100 ball bearings on top of NYC, L.A., S.F., Chicago, Miami, Dallas, etc. Now, imagine what would happen if you lifted up each of the tubes simultaneously. The only meat animals left will be domesticated animals on farms and humans.

Accordingly, I do not recommend worrying too much about how to hunt for food once you run out of ammunition. Instead, you should plan on how to produce sufficient food to feed you and those for whom you are responsible.

Unfortunately, if you successfully implement your plan to produce food, you will become a target for others who are unable to produce sufficient food for themselves.

Thus, you will need a plan to protect yourself and your food production capabilities. The bad news is -- no amount of preparation will allow you to protect yourself if you act by yourself. You will need a self-sufficient community that is capable of defending itself.

If you manage to survive long enough to become part of a self-sufficient community, CONGRATULATIONS! Now the hard part begins, rebuilding civilization.