7.62 x 51mm Blank

Can anybody help with the identification of this white plastic 7.62mm blank? I have posted this item before but the only info that came back was that it is possibly Canadian.
This particuar specimen appears never to have been loaded and the black plastic head is not marked.
Any suggestians appreciated!

AS Bill Woodin said to me some years ago, it is a Canadian round. I have the same in .50 Browning.


I had the same in .50 BMG and it came from Finland with the information to be a Finish experimental cartridge. The former owner had good connections to the Finnish ammo industry.

So what …!!! ???