Don M: Run a barrel micrometer through a Beretta 'Skeet' choke (Mobil or Optima). It has an internal profile identical to a WS-1. It is a very good skeet choke. Now for the real surprise... I have here a Remington 1100 barrel marked 'Skeet' that also has the identical internal profile of a WS-1. It's from a 'Skeet-B' circa early 1970's. I found that interesting... Agree WS-1 and WS-2 is an excellent all around combo.
Well, I don't have any Beretta's laying around(not much need or want) and I don't have a barrel mic'(no need for that eather), so I'll take your word for it.
I will have to respectfully disagree with Miller that the WS-1/WS-2 don't have better patterns than standard SK/SK, for the yardage that they were designed for. I have shot patterns from both and there is a difference. Granted, it's not enough that would make any difference to a good shot in the real world.