Pretty cool, and fairly mean looking with an unturned barrel.
Seeing the above weapon and cartridge, along with others such as the .511 Phalanx (is that right?) and the .510 Whisper and .50 Peacekeeper from SSK... Well, they've got me thinking. I've got a .50 Beowulf AR, and I wondering if I could load it subsonic. Maybe cut the cartridge case down some and seat a longer spire point round and still make a tolerable o.a.l. that would cycle through the weapon. Just musing right now about this, not actually going to try it, yet...