I did not know that about the .50 caliber.
With respect to the navy rifle mentioned...16”/50 caliber...I believe the barrel length of said gun is 50x the bore diameter of 16”.
Bang!!
I had a Manager was a Marine Sargent. She use to say that. I know...not really big on women in combat, but she was a tough broad and always had your back.
One day during a fire drill I caught her scanning the hills in back of the place I work. Muttered something about so many places for snipers to hide.