DARPA's EXACTO(Extreme Accuracy Tasked Ordnance) successfully guided a .50 cal bullet during its flight. The rifle was aimed at one place, and the bullet flew to another area where it was guided.
This may remind some people of Sandia National Laboratory's guided bullet project. Sandia Lab are the one who are working with EXACTO program. It seems like in this case the projectile is closer to conventional size.
From: DARPA via The Firearm Blog
