What if the Schwerer Gustav had a shell ten times bigger? What

File:Schwerer Gustav Grenade.JPG - Wikimedia Commons

800mm (31.5 inch) German Artillery Dora

Artillery Ammunition Comparison

Schwerer Gustav: The World's Biggest Gun Ever Built

WORLD WAR II GERMAN NEWSREEL SIEGE OF SEVASTOPOL SCHWERER GUSTAV GUN 1942 EASTERN FRONT 40884 : Free Download, Borrow, and Streaming : Internet Archive

80cm shell of the Schwerer Gustav, Dresden Military Museum. : r/GermanWW2photos

What is the heaviest shell that can be fired from an artillery piece (not including ballistic missiles or rockets)? - Quora

Schwerer Gustav - Hitler's giant gun - How it worked and why it

The Heavy Gustav, Hitler and generals inspecting the largest caliber rifled weapon ever used in combat, 1941 - Rare Historical Photos

A History Of War — The Schwerer Gustav was a German 800mm gun used