We have 3 ‘clips’ of this at work, and can’t figure out what it is. It has what looks like German markings on it. One pic is a round next to a 7.62x51mm NATO round. I figure Templar or LAV will know what this is.
Austro-Hungarian 8x56mmR.
Used in Steyr M95 straight pull rifles and carbines, that ammo was made after the Anschluss of 1938, when Germany and Austria were combined.
http://www.aimsurplus.com/acatalog/Austro-Hungarian_M95__Stutzen__8x56R_Mannlicher_Carbine.html
looks like 8mm steyr to me.
I knew you would know Tim! 
Gotm4,
Believe it or not I found some of this here in Iraq and it is hiding in the armory. I am pretty sure that the package ( I have the complete box) said 8MM Mauser on it. The headstamp markings are identical and is the same year 38. I’ll see if I can research it more. Unfortunately I have already turned over the keys to the castle.