Unknown Cartridge


#1

The attached pictures show an unknown cartridge to me. Its dimensions are:

Bullet Dia: 10mm
Neck: 11mm
Rim: 12mm
OAL 49mm
Case length: 37.5mm

There is no h/s and there is an odd looking primer. I have a feeling it is something someone has made. Thanks in advance for any information.

DSC_0236