You can buy a four-point shunt for 10A with 5mohms. You can also do this
with wire or PCB:


10A>========*=======*=======>10A
            |tap1   |tap2
            |fixed  |move till calibrated
            v       v
            to circuit

With a PCB you would have the trace to tap 2 not connected and fit a
jumper on prototypes. Later you will know how to patch the layout to yield
the correct shunt (it will still need calibration for accuracy).

Last, note that copper is a VERY poor choice for shunt material (high
temperature coeff.). Use nichrome or constantan instead.

Peter

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