I have a pair of these :
Bullet Ø is .359-.360, measured on visible band off case mouth.
Lenght of case is .630
Ø rim is .420
It does not quite fit any of the old revolver cartridges in the CoW.
No HS at all.
This one is a 9.6 mm Cattle killer cartridge made by Gévelot in France. Bullet is made of zinc.
Great. Thank you.
Now I have a fair selection of cattle killers.