Vocabulary question X + shell + powder = bullet, what is X?
Because usually the threat is that X will be delivered through use of powder the destination of the shell is ambiguous but not included in the delivery.
When you deliver while (unfired) bullets it's generally not considered a threat.
That very much depends on how the unfired bullet(s) is/are delivered. Did we leave a bullet on the lieutenant's pillow or did we give the politician a box of the latest match grade hunting rounds with a bow on it?