Doug,
No, I haven't tried those choke tubes, I plan on keeping the improved cylinder choke in the gun so slugs & birdshot can be used intermittently as needed, don't want to be changing chokes. I have had good luck and good accuracy with foster slugs and smootbore barrels, so unless this particular gun is unusal, or a problem, I think it will be fine. Again, I view the combination gun differently than most, I view is as a survival gun, the gun I'd take if I had to put a bugout pack together quickly and leave the house, or area, and be able to survive & eat. The most I want to change in that situation, is a shotgun shell, be it a slug or birdshot.
Doug, if you are using steel shot, you may want to check the owners manual, I remember reading somewhere, that steel shot was ok in a Baikal, as long as you were using a choke that was extended out past the end of the barrel, otherwise damage to the choke and/or barrel threads might result. I didn't pay a whole lot of attention, because it is not an issue for me, but I do distinctly recall reading it somewhere, you might want to check it out, because, like we say about the old style Savage 24's(and we can now say about the IZH-94), "They ain't making them anymore".
Sincerely,
Garry