Unknown Cartridges - WW2

These cartridges were found close to an RAF base - along the beach.
I assume that there must have been a training range on this beach.

The cartridge on the left is a .50 cal.
I cannot seem to find what the other 2 cartidges are.
The headstamps are K38 F I Z & K40 F I Z.

Does anyone know what these are? And from what aircraft they would have been used in?

Thanks

Jimbo

RAF Cart 2.jpgRAF Cart 1.jpg


Attached Images

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