So I will guess and say 600NE
Yup 600 NE 
Is it larger than .30?
Close enough to the same size
Hint…
This case is the basis for a few different cartridges including one that has been in use since 1902 and in chambered in all popular brands of handguns.
Is it German?
Yes it is…
Does it chamber in a broom? 
no but that cartridge is very, very, very close to it.
Brooms were made to chamber 30 liver, I think they were chambered in about 5-6 different rounds over the years.
My guess 30 luger aka. 5.65x21mm?
Sorry no, bigger than 5.56
Sorry that’s ment to say 7.65×21mm
30 luger
Oh so close, only millimetres away 
So it’s 7.something?
1 Like
I will give you a hint; If you go to the “What’s that gun” page you will find a clue there as I put up the pistol that fires it
So, you say it is German, but designed by an American?
OK, born in Germany counts I suppose, even if he became a US citizen before becoming a gun and ammo designer. One went for sale at the last auction, mint, cased, all accessories and original paperwork! I touched it and drooled.
1 Like
Does this game, which I have just had a brief look at, only include personally owned items or any that you can find?