Could you please post a pic of the rifling? I am curious to see what the progressive twist looks like in the 6 inch barrel. I have a 4 inch, and I am surprised and disappointed about its twist rate....there is barely any twist in the 4 inch. It's like they cut off the last 2 inches of the barrel where the most twist would be apparent (in a progressive twist rifled barrel), and left the very gradual twist rate of the first 4 inches (do you follow me? alternatively, they didn't adjust the rifling machine to compensate for the 4 inch barrel). So, there isn't much spin on the ball as it exits the 4 inch, thereby making it less accurate than it probably could be. Many a squirrel has survived as a result of that!
So, if you can, please indulge my curiousity with the requested pic.