FWIW, the last time that I patterned some factory loads using plastic wads through two dif 'rifled spreader chokes' they both threw IC patterns.
One still sees Sporting Clays shooters on ocassion shooting 'threads'. Can't say that I see any advantage over a cyl or skeet type choke tube, but there are some who believe that wad retarders in chokes exist as well. Hahaha
Cyl chokes will often throw patterns w/hot centers, probably more so today than in times past, but that held true with card wads as well sometimes and even in black powder era, if one can believe what was written on the subject where trials were conducted for pattern effectiveness and penetration on 'standardized' card stock at the time.
The average flushed bird shot behind a good dog is probably well within the CYL or no choke range, at least for the first shot, some pheasant excepted.
