John, I use #8 shot early in the season when there is still foliage to break up your pattern and the grouse flush relatively close but I switch to #7 or #7 1/2 when there is no foliage and the grouse flush farther out. #6 isn't a bad choice for very late season and if you don't have a dog.
My reasoning for the larger shot sizes later in the season it its (marginally) better down-range energy. I use whatever choke combination that my "gun of choice" for the day happens to have.
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