Cannon SLRC.

This is coolbert:

From the Russian media outlet Sputnik and the article by Svetlana and thanks to both.

"US Army Reportedly Developing Cannon Touted as Able to Blast Through Air Defences ‘As Far As Moscow’"

"The Strategic Long Range Cannon (SLRC) is touted as potentially being able to strike targets at up to 1,150 miles (1,850 km) away and fire 50 times farther than existing guns."

SLRC as having the topic of a prior blog entry with additional embedded links.

Some clarification from the Internet web site Global Security.regarding the  SLRC:

"It should not be imagined that the SLRC is simply an enlarged version of a regular cannon. It should not be thought that this is a successor to the Paris Gun or Gerald Bull's big guns, in which a large cannon fires a passive projectile some great distance. Rather, the Strategic Long Range Cannon fires a self-propelled projectile, providing the initial boost needed to get the projectile up to multi-Mach speeds where the on-board propulsion system can initiate self-sustained flight. This booster function in other systems in typically performed by a solid-rocket motor booster. Whether the substitution of a large gun for a small rocket motor is a net gain has yet to be established."

CONSIDER NOT SO MUCH THE RANGE OF THE WEAPON BUT THE ACCURACY, RAPIDITY OF FIRE OF THE CANNON AND LETHALITY OF THE ROUND FIRED. DETAILS ON THOSE ASPECTS I IMAGINE  AT THIS STAGE OF  DEVELOPMENT CLASSIFIED.

Mounting of the SLRC [four cannon per battery] on an ocean-going [?] barge also touted as a possible.

coolbert.