20mm projectile ID

[Burney Davis]

Can anyone ID this projectile please. No markings and measures 20mm x 54mm. TIA

 

[MINENAZ16]

Hello,
As far as I know this short russian 20mm is 54mm long.
Not exactly the same (different tracer element) but no other idea.

 

[AKON_]

HI MINENAZ16
I continued your correct idea a bit...

Боеприпасы авиационных пушек "ШВАК", "ТНШ", "Б-20" - Альтернативная История

Боеприпасы авиационных пушек "ШВАК", "ТНШ", "Б-20" - Альтернативная История

alternathistory.ru

This is one of the development versions of the 20mm T cartridge.

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Hi Burney Davis According to the data, the bullet should have 8 right- grooves. Is this true on your specimen?
Akon