Findhorn Bay. S/Yeti, as a Scot you are no doubt aware of the huge differences in law from England, but others may not be.
There is a public right of recreation on the foreshore, so that clubs are not able to control shooting in the same way as England where they hold leases, usually from the Crown Estate. As Findhorn became well known it attracted a great many shooters from down South. The major "goose alley" flight path was easily accessible, and some of the behaviour was very bad. The behaviour of local antis became very extreme, but it remained a civil matter. I did a morning flight on the key area a fair few years ago and even then the overcrowding plus "skybusting" was unbelievable. My mate (no angel) came over and said "I'm off - if I stay here I shall thump someone" so we went for breakfast early.
The route to controlling individual protesters should be as In England by getting an injunction but this is hard, expensive, and it is difficult to demonstrate a breach.
The remedy in Scotland, as at the Eden, Caerlaverock, Wigtown, is to declare a Local Nature Reserve (banning shooting) and then pass bye laws which which permit such activities within limits. There is a risk here of course as seen at Caerlaverock of totally unreasonable conditions being imposed.
I agree that BASC Scotland might have put more into the problem but I am not sure what they could have done in what had become a very polarised situation.