I don't know if anyone else has discovered the glory of shotgun sniping in this game, but it is truly amazing. These are two vids I recorded with XFire (no audio and the resolution was halved...XFire set that up without me knowing and never again). The shots were done with the Neostead 200, 12 gauge shotgun ammo and magnum ammo.
Video One The kill happens at about 0:50, you can't see much but you can get an idea of where he was compared to where I was.
Video Two The kill here happens a little after 0:43 or so, can't see the kill (again, but this time there was smoke and dust in the way) but you can see the distance behind it.