I ve got several Chinese 10.5 case last month . It is said PRC in 1960s ，The project was held to design a kind of machine gun cartridge better .50BMG，while the project was cancelled soon after. luckily i got someUploading… Uploading… Uploading…
Great photos! Thank you for posting them.
Can you tell us the length of the cartridge case and the length of the bullet/projectile by itself?
Photo below showing 10.5mm cartridges next to 12.7x108mm cartridges was originally posted on the now defunct website http://forum.ammo-collection.com
i will measure and publish it later
The rim diameter would be helpful, too!
I wonder how similar it it to a .408 Cheytac or a .416 Barrett?
To my understanding this is a necked down 12.7x108.