PCP has been trying to market their polymer cases with traditional jacketed bullets with the notable ka-boom failures. There's another company selling polymer bullets with brass cases. This is the first company I've seen which has polymer cases featuring a polymer bullet. Interesting technology which will probably take years to get right.
http://bulletin.accurateshooter.com/2015/01/new-polycase-ammunition-and-injection-molded-bullets/
http://polycaseammo.com/
http://bulletin.accurateshooter.com/2015/01/new-polycase-ammunition-and-injection-molded-bullets/
Georgia-based PolyCase Ammunition has developed innovative polymer-based composite cartridge cases and injection-molded bullets. With a patent-pending design, the polymer cartridge cases are lighter than brass or steel cases, yet are heat-tolerant, and relatively easy to manufacture. These cases will be initially produced for .223 Remington, plus a variety of pistol cartridge types (.380 ACP, .38 SPL, 9mm Luger). PolyCase cartridge cases blend patented heat-resistent polymers with metal elements in the case base
http://polycaseammo.com/