This is my first post here, so here goes.
It depends on what kind of board you are looking for.
Quack, has nemd an excellent one.
It has many, money Tournament shooters on it.
Lots of talk on SC, Skeet, Trap, and shotguns in general.
Another is duckhunter.net.
Along with the regular forums, it has a shooting forum, and also Upland, and Turkey forums.
I hope this helps.