ORIGINAL: Power
I only get a decent pattern out to about 30 yards though. I use the Remington Super-full choke. I don't think it's a specialized turkey choke though, just a really full one.
Just checked and it's a Remington Turkey Super Full choke. I'm going to try some Hevi-shot in the next couple weeks and see if it patterns the same or not. If so, I'll stick with the Winchester Turkey #6's.