A test shot fires from the Office of Naval Research-funded Electromagnetic Railgun prototype launcher located at the Naval Surface Warfare Center Dahlgren Division.
A story from a little over a year ago reported a 33 MegaJoule test. A blog post at Scientific American puts the design range at 20-32 MJ, so it seems the refinements are now in areas other than the energy (e.g. better efficiency, moving from a research device to a better-engineered on that can be deployed). That article also refines the expected range of the gun.
The Navy says that the railgun project, initiated in 2005, will yield a 20- to 32-megajoule weapon that shoots a distance of 50 to 100 nautical miles (roughly 90 to 185 kilometers).