Estimating the weight of 20-inch naval shells

What would realistic 20-inch naval shells weigh?

Larger American shells provide provisional projectile and gun-mass estimates, while a short barrel would trade range for enormous impact when a 20-inch shell did hit.

Armor-piercing and high-explosive construction produce different shell weights, so there is no single universal figure. Later follow-ups separate projectile weight from the mass of the gun itself and put a short 35-38-calibre weapon in roughly the 130-140-ton range. The short barrel would limit range, but any hit would still deliver a very large shell. Calibre scaling follows area and volume relationships rather than a simple constant percentage. Every figure remains a rule of thumb rather than final design data.