In my 12 gauge browning cynergy, I'm using .650", with 3" 1.75oz. #9 TSS. I did quite a bit of patterning with that shell, starting with factory full choke and going tighter from there. Each pattern got better and better, as the chokes got tighter.
That shot is so small and hard, I don't think you can "over choke" it. It's a gobbler hammer, for sure!
