I remember one of the locations I visited in France had this story of how a round from a US battleship soared 30km and hit the actual artillery piece in the gun battery. Instead of exploding and destroying the artillery with its crew, the round was a dud, so it destroyed the gun piece then continued on to puncture the wall behind it, instantly killing everyone in the sealed communitions room. Then it broke through the other side and traveled ~1km further.

I believe this was at one of my stops in Normandy, my trip was years ago with a whole lot of stops so my bad memory has meshed a lot of it together.

I've tried searching for this a couple times before but have not been able to find anything on it.

Sorry if this is in the wrong subreddit, I'm rather sleep deprived and the rules of r/history directed me to here for asking questions about specific parts of history; but I might be asking for something too specific.