| Cylinder | Skeet | Improved | Light | Modified | Improved | Light | Full | |
| | | Cylinder | Modified | Modified | Full | |||
20 Gauge Field Choke | Diameter .624 Constriction .000 | X | Diameter .616 Constriction .008 | X | Diameter .608 Constriction .016 | Diameter .604 Constriction .020 | X | Diameter .592 Constriction .032 | |
20 Gauge CCP Competition Choke | Diameter .624 Constriction .000 | Diameter .620 Constriction .004 | Diameter .616 Constriction .008 | Diameter .612 Constriction .012 | Diameter .608 Constriction .016 | Diameter .604 Constriction .020 | Diameter .600 Constriction .024 | Diameter .596 Constriction .028 | |