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.

"The price of good shotgunnery is constant practice" - Fred Kimble