I was given a large batch of 7.62x51 cases that were sourced from some guys in the Australian SAS. In this batch were about 40 cases that I cannot identify and I need help. I think these guys brought this ammo home from Afghanistan but I am not sure.
They appear very similar to the 7.62x51 in terms of overall ratios and appearance but a bit bigger. The details I have are:
Case is a rimless bottlenecked design
Cases are de-primed and have a dual flash hole with centre pin
Calibre appears to be 7.62 (the empties measure about 7.7)
Case is 54mm long
Rim Diameter is 0.408"
Neck outside diameter is 0.341"
Base diameter is 0.482"
The headstamp is a dooser - it is almost completly in what looks like arabic script (although the letters OV do appear. The darned thing has defeated every attempt to photograph it I can come up with.
So, any ideas what this case might be? A search of the databases suggests only one case with these dimensions - a 7.65mm x 53.5 Marga. Any idea why this cartridge would be being produced for military applications by a middle eastern country?