One of the most satisfying ways to control jays and corvids in general ,is to call from inside a wood ,partly concealed.You need some skill at producing a rabbit squeal as you would when foxing !.Corvids cannot resist coming to investigate a squeal ,just to mob the predator thats apparently responsible .Dont hide too well as you need to raise the shot gun as the bird is coming in on the wing ,just as they are about to land is best. Wait till they settle in a tree and youv'e blown it as they will spot the movement and be off out the back door .Corvids and birds in general find it hard to focus