[Chunky]

You could shoot at them with your trad bow...no danger of breaking the law and you might get close enough to scare them..LOL

You could try one of those owl or hawk decoy things, that are suppose to scare off birds.

You could stop feeding for a few weeks and they would probably give up and become someone else's problem.

You could set your feeder to go off after dark and not feed in the morning for a bit.