While totally in agreement that a cylinder boring can indeed be most useful the thing which I think most astonishes me about this entire thread is that not a single person has pointed out that;
Cylinder is "Not a Choke" but "Lack of Choke". By definition Choke in a shotgun bbl means constriction, Cyl has none. Well anything not exceeding .003" is I believe still considered cylinder, but not considered "Choke". A barrel is thus Not "Cylinder-Choked", but is Un-Choked or Not Choked whichever way you prefer to say it.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra