Calibers?

The NRA Firearms Fact Book has a good list.
You could order one from the NRA.

A book called Cartridges Of The World probably would too.
I haven't bought that one yet.

http://world.guns.ru/ammo/am00-e.htm look on left bar, it will help a little

I have a Hornady cartidge poster that came with a gun rag once. Its great to look at when you are wondering what a type of cartridge is. I have looked for it all over the web but cant find it. Its useful because the cartidges are actual size.

This is what it looks like.

Fella's;

The 'Cartridges Of The World' referenced is by Frank Barnes. Couldn't tell you what printing it's in now, but can tell you that it's an extremely useful book to me.

900F

Try "Shooters Bible", alot of good info IMO....

I second (or third?) Cartridges Of The World. Great book.