Unidentified projectile with link

Found near a Canadian training site in the UK, has a link on it and the nose is corroded away, any ideas.

Link looks a bit like one of the 7.9mm BESA variations

A link on a bullet ?

Looking at it closely the base is lightly knurled, is it a jack plug for a radio?

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I agree with Topfmine.

Definitely NOT a cartridge or projectile.