Well to be honest from what my experience with the .675 Carlson's choke in my 835 shooting Hevi-13 loads vs shooting the .676 Star Dot, let's just say the Carlson's choke didn't perform very well at all. It shot lead loads very well, but not very impressive with the Hevi-13 loads. I would only speculate that it's the tube internals that made the Carlson's lack. But it wouldn't even come close to the Star Dot. I just ain't a very big fan of Carlson's turkey chokes. So to answer your question I would opt for a better choke to try shooting Hevi-13 loads.