Backstamp identification

1942 Z VII DI

Does sombody know more about this bulletshell (what is Z and DI).

.303 British manufactured in 1943
DI = Defence industries, Canada
Z = Nitrocellulose Powder (as opposed to Cordite)

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Also, all DI production was with Boxer Primer ( non corrosive) Cases, annealed brass for rifle calibres, and quality ammo. ( better than similar Cordite loads by other makers.

Where found?
Doc AV

Just for completeness: VII = mark VII ball (175 grain bullet).

I’m still reloading and shooting with WWII Canadian made .303 British cases.

In Belgium with metal detector