RE: rifled choke
Maybe, I have heard mixed reviews. I have never used one myself though. If I was going to spend that kind of money on ammunition I would go ahead and go with the fully rifled barrel.
To get the accuracy they can achieve you are still going to need some sort of sights, a bead just won't cut it if you want to reach out there. And I wouldn't suggest mounting a scope to the reciever of a switch barrel gun. I know it's drilled, but don't expect great results or a great deal of consistancy.
My opinion anyway.
Paul