Steel is an ammo brand that causes ammo to deal 30% more damage.
Although lacking in any special abilities, steel ammo is a good choice for general use, but is less effective than silver or elemental ammo when attacking vulnerable enemies. It is a rare find outside of god gifts and certain high-level monsters. It can be found on tomahawks, javelins, sling bullets, and bolts.
Prior to 0.15, steel ammunition weighed 300% as much as normal.