I suggest that you contact William on the Sumtoy Custom Choke website and talk to him about your gun and what you want from it. If you give him the gun ,choke, shell,distance and what numbers you are getting he can tell you if he can help. It is well worth the call.
Sumtoy has been in the business of making target chokes and skeet .trap,sporting clays chokes and has some of the top shooters in the nation and Georgia shooting these chokes. Until he started the turkey chokes all of his chokes were silver in appearance.
There are guns out there in the target class that are shot for money who choose Sumtoy chokes on their $3,000, $5000, $8500 custom work because they work for them.