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Could the "Torpedo" be referring to a bullet made by Brenneke?

https://www.brenneke-ammunition.de/en/

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Verrrrrrrrrrry interesting... and quite possible?

'Strong Jacket' is described and shown in the 1938 DWM Ammunition Catalog on page 59 and some 8mm projectiles are listed as 'Strong Jacket Torpedo' on page 73. DWM 1938

I was unaware of the 'Brenneke Torpedo' and its long history until reading your post. Just the sort of thing that makes these threads valuable!