Apparently there's some kind of fancypants new bullet being shown at SHOT show
I'd embed the youtube video here but the blogger thing for doing it isn't working, and I don't feel like bothering with doing it manually, just click the link.
Basically it's a bullet cut into three parts, that spin out from the rifling and are held together by wires to a central shaft. The reasoning is to give a shotgun like spread that never spreads too far, and doesn't need much distance to reach its spread. I'll have to see some ballistics tests before I'm convinced.