Unknown Cartridge please help

I have this cartridge and I don’t know what it is… please could someone ID the maker of the cartridge and the use of it…

headstamp MYM 6-293-36

the unknown cartridge with a 7,62x51 to compare

Hello Gyrojet, I believe this is a replica gun cartridge but I don’t know which company made it. Another specimen was reported years ago by Jonny C. (see IAA bulletin 405 p. 28 and ECRA 405-14).

Yes. I think it’s also a toy cartridge, but I have not been able to find out anything about it.