I think it was Jack O'Connor who said that the cylinder choke was a cracker jack of a choke. I have always watched Beretta's Bird Hunter's Journal and I believe Steve Smith uses at least one cylinder choke in his Beretta O/U 20 gauge for quail, pheasant and grouse. I have Cyl/IC in my Model 21- 12 gauge that I use for pheasant and it does a good job. I also use Cyl/Cyl in my Browning Citori and my Beretta 686 when I shoot skeet. I wouldn't use anything else.