Adamantite Shells

Adamantite Shells were the most powerful crafted bullets in Azeroth, before the introduction of Mammoth Cutters.

Source
This item was created by using. The machine had 5 charges, allowing the user to create up to 1000.

The could be crafted by engineers with a skill of 335.

The schematic was sold for in somewhat limited quantity by:
 * in The Exodar
 * in Shattrath City
 * in Silvermoon City