Shell, 80 cm (Schwerer Gustav), with aerodynamic cap

Krupp 80 cm Kanone Schwerer Gustav (Dora) Railway Gun

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What if the Schwerer Gustav had a shell ten times bigger? What kind of damage would it do? - Quora

Why did Nazi Germany never make more Schwerer Gustav heavy artillery in WW2, especially to the Eastern Front and attack cross channel to Britain island? - Quora

Krupp 80 cm Kanone Schwerer Gustav (Dora) Railway Gun

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Definitions and Information about Naval Guns - NavWeaps

Shell (projectile), Military Wiki