I shoot a 12 ga. Winchester 101 with Browning extended chokes. SK/IC for sporting clays & quail, IC/LM for first season dove, LM/M for late season dove/pigeon, M/IM for waterfowl, F/Turkey for Turkey.
My daughter just got her first O/U. A 20 ga. CZ Redhead Premier. I ordered Briley chokes in SK/IC/LM/M for her. She shot her first dove season with me, and slayed them. I used it often this dove season too with the IC/M chokes. I think I got better percentages with this gun over my 12 ga.!