You can buy a magpie decoy from h&f and I have tried them in conjunction with an egg on the ground given that they attack nests. The biggest thing is to realise that they are territorial so once you have worked out where their spot in the paddock is just push them off and hide nearby. They will be back shortly.
If the are sitting in a paddock then a drive by shooting with one bloke out the passenger window while the other one drives can work. They normally don't fly until the vehicle stops so get the driver to come to a slow stop and shoot it just before the vehicle stops.
The distress call has been hit and miss for me but when used in conjunction with decoys and the right spot they do come in.
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