I have got the best patterns with a Rhino .660 choke, but my gun has a 21" barrel. I have a hunting buddy who has a 23" and he also gets great patterns out of his Rhino .660. I also have another hunting buddy who has a 23" barrel and shoots very good patterns with his Jelly Head .660. So from our experience the .660 seems to throw the best patterns of course it depends a great deal on type of shells used. We mostly shoot Nitro ammo, but I have also had good results out of my 21" with Mag -Blends.
Good luck
Ridge Rooster