http://members.amaonline.com/firepower/html/50bmd.htm
I ran into this when I was searching for some .510" stuff. I was looking for something like the short a few months ago, but found nothing.
Just thought you guy's might enjoy this as I've never heard of them before.

I have heard of this. It's basically a short 500A2 that is being developed for medium range barrier/vehicle penetration purposes. Nothing really portable goes through armoured glass like these things do without all the muss and fuss of a .50BMG/500A2. I've talked to the guy developing this and he has some very interesting buisness arrangements.-Rob