Looks like Plastic ammo might be a reality.

[Jakal]

The 458 Socom guys are working with these and not the best results but you can decide for yourself. These are designed as frangible/cave/tunnel clearing by the Israelis.

http://www.458socomforums.com

just search for arx and the posts' will appear.

This is one of the main threads....

http://458socomforums.com/index.php?topic=2492.0