Mystery 12Ga

[CINDERS]

I received this today along with some other unwanted ammo from a friend who's inlaw passed away and he wanted a good home for it.
So I ended up with some 310 Super packet with 25 lead projectiled rounds.
A full packet 32 rounds MF 55 MKVII ball and this 12 Ga cartridge which has me baffled.

So it is a paper roll crimp no shot size, head stamp is Eley Kynoch 12 Ga CIANZ it is 46mm long and is stood next to a Win 2 3/4" 12 Ga plastic.
I cannot hear any shot rattling in it but that does not mean there is none but there are no other markings on it, the CIANZ it this a NZ firm.

I thought it may be a cordite round for starting a tractor, could anyone here help identify this cartridge for me it is very much appreciated by myself.

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