Bren Gun Mag. Loader ?

[tankhunter]

Small but nerdy point!.......

Those empty cases Flying 10, may have been fired in a rifle.
If it had been from a Bren, there WOULD be VERY distinctive OVAL indentations.
In each struck primer. From the also Distinctive shape of the Bren Firing pin.

The earlier ZB series of LMGs would have produced similar witness marks on primers.