Thread: Rifled chokes

In the century before last English gun makers produced paradox guns basically a shotgun with the last 4 or so inches rifled with a slow twist. It significantly improved the accuracy of slugs and the conical bullets designed for them and still gave acceptable patterns with shot at close ranges.
So it's not a new idea. I wonder if interchangeable ones wouldn't either unscrew or tighten up excessively.
In my experience buck shot and bbs pattern best with a cylinder bore, tighter chokes seem to spread the pattern for some reason I can't figure out