12.7x81mm Vickers "K41 FIZ"

I think “F” stands for semi AP. Why does semi AP exist, why not to fire total AP at everything? Maybe semi AP will not defeat the target. One can’t actually know which target will show up at the battle field.
scan0217 DSCF9746

Yes - the F indicates semi-AP. Tony Edwards’ site states they were cheaper to make and proved just as effective as the AP rounds.

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Thanks. Then why not to make semi AP only? Will save some metal and weight of transportation.

Unsure. I can only imagine that the AP rounds were subsequently improved, as they certainly saw action in WWII and were still produced post war.

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The semi AP was also steel core so probably made of a lower grade alloy steel but almost as effective against this ctg’s main target which would have been aircraft.
IIRC the Germans discontinued use of tungsten in their 7.9 ammo at about the same time.

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