Howard,
I agree with Jason: 25mm cartridge cases and links fired from an M242, 25-mm chain gun as mounted in an ASLAV (or on RAN patrol vessels).
The link is the M28. It is a pressed steel two-piece link and only used with the 25-mm cartridges for the M242.
The cart cases are the C1030 steel case, annodized with a light olive green finish. The cart case has a characteristic groove around the circumference, a centimetre or so below the shoulder - it is just visible in your image.
As far as I know, the current projectiles available in Aust are the APDS-T (M791), HEI-T (M792), and the TP-T (M793). The cases shown could have been loaded with any of the above.
Mike C
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