Hey Jeff. Not sure if this will help much but have you tried Wikipedia? Take a look here about 1/2 way down the page you will see some results. Click on Test of 5.7 x 28 mm and it will take you to another page.
good call....like I mentioned, it would be a good 'specialty' weapon to keep in the event you need to defeat body armor, but I don't think I would carry one as my primary defensive gun.