For long DARPA had been working on the self-steering bullet program dubbed the EXACTO, an acronym of EXtreme ACcuracy Tasked Ordnance, is a sniper rifle being developed by Lockheed Martin and Teledyne Scientific & Imaging.
The Extreme Accuracy Tasked Ordnance (EXACTO) system seeks to improve sniper effectiveness and enhance troop safety by allowing greater shooter standoff range and reduction in target engagement timelines. The objective of the EXACTO program is to revolutionize rifle accuracy and range by developing the first ever guided small-caliber bullet. The EXACTO 50- caliber round and optical sighting technology expects to greatly extend the day and night time range over current state-of-the-art sniper systems. The system combines a maneuverable bullet and a real-time guidance system to track and deliver the projectile to the target, allowing the bullet to change path during flight to compensate for any unexpected factors that may drive it off co

EXACTO passed another developmental milestone in late February. As per the video below, experienced and novice shooters alike were able to strike moving targets. And, in the case of expert shooters, able to hit actively evading targets as well.
[YouTube] [/YouTube]
[YouTube] [/YouTube]