Hello, I have posted about these cartridges a couple of times before but never had any luck, they are both the same diameter (I believe .27).
The larger one stands 9mm tall while the other is just shy of 7mm
One has the headstamp of “SI” while the other is blank. They were found on the coast of south Australia.
I have spent quite some time online but had no information. I was wondering the manufacturer and the name of the bullet.