In the Grades page, the repro documents have this to say about the SS, note it states the chokes designed for steel shot are not the same as the standard chokes in an effort to give best pattern with steel shot, whatever that means?
http://parkerguns.org/forums/picture...&pictureid=977
And this has the Repro choke listed for what I assume is the standard chokes:
http://parkerguns.org/forums/picture...&pictureid=979