I'll work on that. I've got some fired 6,8 brass now, so I'll make up a dummy round or two. I've not yet seen a pic of the 5,8 round with a 7,92x33 kurz round, and I think I'll add one of the 1950s 7x43mm *.280 calibre* EM-2 rifle rounds to the oic for comparison's sake. They're actually a .276, so are closer in size and performance to the new cartridge than it might seem.
from left to right: British experimental .280 (7x43mm) cartridge for EM-2; Soviet 7.62x39mm M43; US/NATO 5.56x45mm (.223 Rem); US/NATO 7.62x51mm (.308 Win)
Enfield EM-2 / Rifle, Automatic, caliber .280, Number 9 Mark 1, (Great Britain) circa 1952:
H&K XM-8, 6,8x43mm [Germany-U.S.A.] circa 2004: