"The U.S. Army took two shots from its Extended Range Cannon Artillery system, which both reached 65 kilometers in range and hit their intended targets, in a demonstration at Yuma Proving Ground, Arizona, on March 6, according to Brig. Gen. John Rafferty, who is in charge of long-range precision fires modernization, the Army’s top priority.

The demonstration proves the cannon is capable of firing roughly 40 miles, which is about the distance between Washington, D.C., and Annapolis, Maryland. The capability would also benefit the service should it face near-peer adversaries on the battlefield.

It is unclear whether the Army was pushing its shots out to the maximum range of capability or if the projectiles are capable of reaching farther ranges.

The ERCA cannon is a step ahead of a bigger program to develop a strategic, long-range cannon that could shoot 1,000 nautical miles, or 1,852 kilometers."

defensenews.com/land/2020/03/06/army-takes-40-mile-shots-from-extended-range-cannon-in-demo/