Cartridge identification
 

Asking for a friend of a friend, anyone have any info?
Thanks
https://i.postimg.cc/Gm3wscRp/1360.jpg
https://i.postimg.cc/CKtWtkqZ/1362.jpg
https://i.postimg.cc/FHPty2FV/1364.jpg
https://i.postimg.cc/q7gPjjzV/1365.jpg

Thinking, 15 mm BESA, a heavy machine gun used by the Brits in limited quantities.

Grizz

.50" Vickers - 7 variants
 

Headstamp, RᗑL 40 F I Z
https://forum.cartridgecollectors.or...amp-list/32414

Great Britain -- "Broad Arrow" headstamp,
https://sites.google.com/site/britmi.../great-britain
R/|\L Royal Laboratory, Woolwich 1880-1954-

.50" Vickers - 7 variants,
https://sites.google.com/site/britmi...5-inch-vickers

Here are the dimensions for a .50" Vickers cartridge, can be measured with a caliper,

https://municion.org/producto/5-vickers-mk-i-rimless/

Choose [English] :)

https://municion.org/Ficha-13-081-BGC-010-0010/

Thank you very much ^

Surprisingly good condition for it's age and not common.

Grizz