I agree with Don that .018 is sufficient in the first barrel but I also am a lover of tight chokes so I can understand where Mark is coming from. If your bore is .732 why not ream it out to .728-.729 and you'll get the .020-.021 you are looking for. Don's load of 8's would work nicely as I routinely use 1 1/8 of 9's in the first barrel until the weather gets bitter cold. My first barrel to me is used to knock the bird down or slow it up until I can anchor it with my second barrel using premium 7 1/2's. The more I shoot the more I have come to the conclusion that people obsess too much about choke.
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