Like many others: the 16 inch main battery on U.S.S. Iowa - I served my Midshipman cruise on Iowa in 1957. When 3 or more guns fired, the whole ship rocked. We used to say we were throwing a cadillac over the side with each shot, because each shell cost about that much.
Before the days of electronic computations, the firing solution was done on a manual analog computer the size of a small desk. It had dial-in knobs all over it's 5 workable sides for inputting course, speed, wind, range, etc. variables, & a world of cams and gears inside to output azimuth, elevation, & time of firing order. What a kluge..... but it worked.