Energy cells. Cells and Metal are one and the same in terms of ammunition units. Metal is simply Cells with a different label, as used by the Engineer.
Rockets make things go boom when they hit something.
Adds 8 explosive damage when detonated by an EMP.
Adds 1.4 explosive damage when detonated in a Dispenser.
12-gauge shotgun shells.
0.25 explosive damage per shell when detonated by an EMP.
A special ammo type used internally in the game, carried only by the Demoman.
A special ammo type used internally in the game, carried only by the Scout.