Unknown reduced .50 - 9x90?

IMG_9899 IMG_9900

Hi guys,

can someone identify this cartridge?

lenght of case 89,73 mm
lenght of cartridge 117,36 mm
diameter of bullet 9,10 mm

Could it be an experimental of the MEN 9x90?

Best regards

Chris

Lots of people have wildcatted the .50. You can find the .50 case necked to everything from .17 to 20mm. All of them home-grown, not part of any government or company effort.

I even have one necked down to take a 1mm real phonograph needle.