There's now a steel-reinforced bullet for 3D-printed guns
 

Despite all the hype surrounding 3D-printed guns (good and bad), they still haven't truly taken off outside of enthusiasts. A reason for this is, perhaps, the lack of powerful ammunition -- something that's not 3D-printed or, put simply, generally...

http://www.engadget.com/2014/11/05/n...=rss_truncated