[HangnJudge]

http://www.gizmag.com/sandia-self-guided-bullet/21286/

[Paladin2]

http://www.military.com/video/ammunition-and-explosives/ammunition/sandia-laboratories-self-guided-bullet/1432222481001/

[grobdriver]

And so we come full circle - to smooth bore weapons.
I guess even a sabot round would be spun by the rifling... unless the projectile were disassociated from the sabot casing via (real tiny) ball bearings.

Heh.