By concidence I just got through cutting about 8 inches off of a side by side 10ga percussion shotgun, that had screw in chokes.
I personally just didn't like the choke tubes, and I wanted a shorter lighter gun anyway. One problem I had was tearing the patches on the notches, that are required so the choke wrench has something to hook on to, and it was something else I felt I had to deal with everytime I cleaned it after shooting.
I never could hit anything with this gun, anyway, until I installed rifle sights on it. So, I am going to put the front sight back on, and make it a 10ga roundball gun for close range deer hunting, etc. Of course it will probably still shoot shot, too, just maybe not as tight a pattern.
Now, I will have a fast handling, short, and powerful weapon. Accuracy will have to be determined later.