Unknown cartridge

Hello everyone. I stumbled upon a cartridge that I don’t really know what it is. If you might have a idea I would be very happy to hear it. I put a coin beside it so you can have a comparison of how big it is. Because the cartridge is partly destroyed.
Thanks a lot

What are the measurements and the hs?

There seems to be a very faint headstamp that would help greatly.

Maybe you can clean up the head of the case, making some headstamp visible. You should use a soft copper brush. Or you can drop it in a hot water solution of salt, vinegar and some dishwasher soap. I suppose you are from Europe. Where did you find it? Is it magnetic or not?

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I believe the headstamp says 5MZ and 82

I found it near a abandoned military training site. In Germany. Thanks for the tip how to clean it. I’ll try my best

The measurements of the HS is 2 cm

And the length is?

9.5 cm to 10 cm. I can’t see it actually because it has a big dent in the side.

Then your’s should ba a 12.7x99 (.50 BMG).

Try to give measurements always in millimeter.

Okay i’ll do. Thanks a lot