An M777ER towed howitzer with the XM907 cannon sits in front of an M777 with the original, shorter barrel. US Army
Task & Purpose: The Army's New Supergun Could Put China On Blast
The Army is working on a supergun with a 1,000-mile range that could potentially hit targets in the South China Sea from a gun pit on land, Army Secretary Mark Esper told reporters on Wednesday.
"You can imagine a scenario where the Navy feels that it cannot get into the South China Sea because of Chinese naval vessels, or whatever," Esper said during a media roundtable. "We can – from a fixed location, on an island or some other place – engage enemy targets, naval targets, at great distances and maintain our standoff and yet open the door, if you will, for naval assets or Marine assets."
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Update: Proposed Army 1,000-Mile Supergun Could Be Ultimate Standoff Weapon (DoD Buzz)
WNU Editor: To have a range of 1,000 miles, you are going to need a very big gun. A little bit of history. A Canadian engineer (Gerald Bull) worked on a supergun for Saddam Hussein code-name Project Babylon. But Gerald Bull was assassinated in Brussels in 1990.
Update #2: Here are some more details on this U.S. Army project from last year .... Army Building 1,000-Mile Supergun (Breaking Defense).