Cartridges II

[CINDERS]

I've started another thread on them as the other one as some of the pics by myself and RCS are not opening up for some reason.

Anyway I'd like some assistance with these two that I found in my wildcats lot (Not supposed to be there).
The H/S is MF = Munitions Footscray
73 - 1973
7.62
F3

The F3 and the black primer has me stumped what do these both mean is the black primer a proof loading!
As always I appreciate the help by the members here.

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