mention the 2 gauge I see in vienna and meanwhile Springer's Erben was kind enough to send my some pics. http://forums.nitroexpress.com/showflat.php?Cat=0&Number=370941&Main=370917#Post370941

its one of three made in 2000 by Giles Whittome in london
comes with 35 rounds, price is 495000

the ammo was looking very professional made, maybe they rework machine canon brass. bullet diamter is given here with 33,38 mm.