Edged ammo is a blast to watch tear through a target.
Joerg did similar ammo for his demonized version of the Oreo pump-gun a while back.
On pouch wear, the steel cubes I was shooting for awhile didn't wear on the pouch noticeably after several hundred shots, so probably not a big issue.
Using this as a shape to cast is a cool idea--cheap too.
I'm going to take a wild guess that supplies for nuclear shielding are maybe not so cheap.
--but how cool that such things exist. I liked that link.
Wear a glove if you shoot these and let us see pictures of the carnage--or video even better.