20 mm brass projectile


#1

Hi,

strange projectile for ID, brass, hollow. Did anyone meet with a similar one?

thread ~14 mm
d = 19,9
driving band = 20 / 20,55 mm
l = 40,8

Regards


#2

12 grooves on driving band.

I can not find a 20 mm weapon that has 12 grooves.


#3

No idea about the number of grooves but with the missing tip / nose cap it’s hard to know what it looked like before it was fired.