I have three fired cases given to me by my late grandfather who saw service during WWII, I suspect they are very common calibres from the period and i think i have correctly identified them, but i would like confirmation from those more knowledgable than myself, so here goes…
from left to right in the above photos;
case length: 108.5mm
neck diameter: 20mm (approx, neck is distorted)
case diameter: 25mm
rim diameter: 22mm (rebated, rimless)
case length: 99.3mm
neck diameter: 12.8mm / .50" (approx, neck is distorted)
case diameter: 20.3mm (rimless case)
case length: 80.1mm
neck diameter: 14mm / .55" (approx, neck is distorted)
case diameter: 18.4mm (rimless, tapered case)
I’ve added a .303 case as an indication of size
I think they are 20mm Oerlikon / .50 cal browning MG / .55 Boyes anti tank
how far off am i?
could someone please confirm identity and post photos of the complete rounds?
also an indication of some of the headstamp meanings;
on the first round, does OeZ indicate Oerlikon and nitrocellulore propellant?
second round, whick manufacturer is RA?
third round, B.I.Z? (on .303 I’d take this to mean Incendiary Mk I, nitrocellulose propellant, is the same system of marking used on larger calibres?)