I am having trouble identifying the country of origin and factory for the below cartridge. Any history would also be good to know.
I believe this cartridge is a 43 Mauser/11.15x60Rmm. The dimensions are:
Bullet diameter above case neck: 0.428 in.
Neck diameter: 0.465
Shoulder diameter: 0.516
Rim diameter: 0.587
Base diameter: 0.5136
Case length: 2.387
Overall length: 2.93
In case the photo isn’t clear, it is a four element headstamp, which is divided by lines and has a beveled base. Starting from 12 o’clock a symbol of a crown, 3 o’clock “87”, 6 o’clock “J”, and 9 o’clock “3”.
Any information about origin, history, etc. would be greatly appreciated.