No I never tried it. I want to turn this into a turkey gun. That is kindof why I want to shorten it too. I was thinking about having it shortened to 22"-24". JC had mentioned that the polychoke was a pretty good setup when I bought it. So while I want a shorter barrel I am a little torn on what to do now.
I would suggest taking it over to X ring and let them take a look at it. Find out if they can cut the barrel and remount the polychoke, and how much that would cost. Get a quote on cutting the barrel and threading it for the screw in chokes as well. Then, go with your gut--get what you want.
If you're not in a rush, pattern the shotgun as is on a large piece of paper or cardboard. If it shoots tight enough and it's on target, then I'd seriously think about leaving it alone. If the polychoke isn't tight enough, then go with the screw in chokes and get the turkey tube (extra full?).