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The Mk8z was intended as dedicated machinegun ammo for the Vickers. Tonnes and tonnes of it have been shot through Enfields, but with many people observing it is a bit on the hot side.
The Z after the Mark 8 refers to the powder.
The British used to use Cordite (looks like cords or strings). When they changed to nitrocellulose powder ("normal" smokeless), they added the Z to the headstamp.