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The problem with that concept is making it amphibious sharply limits how well armored it can be.

It may amuse you to know that all the technological bases for a Mammoth Tank do in fact exist; the only missing element is that a tank that big would have relatively poor mobility.

A relevant side point: the U.S. Army apparently defines hypervelocity as referring to artillery projectiles at or exceeding 3,500 fps and tank cannon projectiles exceeding 3,350 fps. While high, these velocities are only about one-third of those that correspond to the civilian definition of...

Sort of. From what I've been able to find, the Advanced Tank Cannon System (ATACS) was intended as a next-generation upgrade for the Abrams tank, consisting of an XM291 gun paired with an XM91 autoloader. Both the cannon and autoloader were designed to be interchangeable caliber and could...

The French defense firm Nexter is known to be conducting trials with a 140mm mounted on a modified LeClerc testbed, while Rheinmetall showed off a 130mm/L51 gun at the Eurosatory arms expo back in 2016 and more recently showed off video footage of that gun mounted on what appears to be a...