40mm Identification

Hey guys im new on here,
acquired this 40mm shell a couple of years ago, looking to see if anyone can tell me a bit about it
any information would be appreciated

A base/headstamp shot might be a big help.

Is the case 228mm long? If so it is a 35mm Oerlikon.

  • @ milloy: Definitely it isn’t a 40mm shell case! To me it looks like a 30mm [30x172] rimless shell case. The shell case length should be approx. 172/173mm [6 13/16 inch] with a head diameter of almost 44mm [1.732-inch]. The headstamp markings [if any] and the primer type will tell more. Liviu 06/21/09