I think that "ammonite" is what they make ammo out of. Or, it is that of which they make ammo. Or, ammo is made of "ammonite" (parenthesis optional).

Crayfish are in the creek in your back yard and if you want to fix them in a gumbo then, yes, you can mail some to me. Crayfish also worship Chemosh (this isn't well known, but I have it on good authority. I made it up).

Ammo is better for warship than for worship. That's just my observation. Your opinion may vary.