"1919 Guns"

I had some sparse specifications of large caliber naval guns, also dating from March 1999. I would guess that all the muzzle velocities were intended to be about 2,700ft/sec:

Gun        Shot         Weight of piece

19in/45    3,900 lbs    205 tons
18in/45    3,324 lbs    175 tons
17in/45    2,800 lbs    147 tons
20in/45    4,480 lbs    240 tons
21in/45    5,180 lbs    278 tons