My Dad was a Lt. on an LCI,during WWII, PTO. He used to tell me that up forward, after the big guns fired some miles behind them, that they could literally see the big projectiles flying over.
That wouldn't surprise me at all. Those rounds are truly massive.
If I was on watch during a gunnery exercise on the Berkeley (DDG-15), I used to get a kick out of going over to the surface console and watching the 5-inch rounds. You can track them on radar.