If you remember those old Mad Max movies, ammo is a precious commodity in the Apocalypse. Not everyone lives in the US, where ammunition rains from the sky like manna. So if are in an ammo poor country, making your own or reusing your ammunition is a life saver.
If you can’t reuse, then stockpile all you can so you have plenty when the zombies get you…
Here are a few links to help you master your ammo making/recycling skills:
Equipment for Bullet Casting: How to Make Your Own Ammunition — powered by eHow.com
Dealing with Duds: How to Make Your Own Ammunition — powered by eHow.com