Ammunition

Ammunition is the term used for expendable ordnance material used in charging firearms of all kinds; as powder, balls, shot, shells, percussion caps, rockets, missiles, energy, etc. The purpose of ammunition is to project force against a selected target or area.

Special and no ammunition required
A few weapons in the Fallout games do not use ammunition in the traditional sense:
 * Solar Scorcher (Fallout 2)
 * Meat cannon (Fallout: Brotherhood of Steel)
 * Recharger rifle (Fallout: New Vegas)
 * Recharger pistol (Fallout: New Vegas)
 * Red Ryder BB gun (Fallout: Brotherhood of Steel)
 * Rock-It Launcher (Fallout 3)
 * Junk Jet (Fallout 4, Fallout 76 and Fallout Shelter)
 * Water gun (Fallout 2)
 * Thirst Zapper (Nuka-World)