I'm not sure specifically which 'Charlie 777' real story you are referring to. There could be many people or things named Charlie. Maybe it's a code name for a project, or a person's nickname. Without more context, it's hard to tell the exact story.
Well, 'Charlie 777' could potentially be part of a military or aviation related story. For example, in military, 'Charlie' is often used as a code for a particular unit or target. And '777' could be a call sign, a serial number, or some form of identification. However, it could also be a completely fictional or local story within a certain community or family. Maybe Charlie was a gambler and 777 was his dream winning number in a casino. But really, we need more information to accurately tell the real story.
The name 'Charlie 777' is rather ambiguous. It could be related to a personal story, like a story about a person named Charlie who has some sort of significance with the number 777. It might be his lucky number, or it could be related to an event that happened on the 7th day of the 7th month in a particular year that was important to Charlie. But again, this is all speculation without more details.