The term 'PUT BULLETS IN' is a job description that requires the loading of bullets into a gun or other weapon. The crossword solutions for this term are LOAD, which is a four-letter word. To LOAD bullets into a gun or other weapon, one must insert the bullets into the chamber of the gun or other weapon. This is done by pushing the bullets into the chamber with a finger or a tool. Once the bullets are in the chamber, they can be fired from the gun or other weapon.