Too many variables to consider, but I've killed a lot of grouse with my Dickson 28 that is choked near cylinder and light full. I shoot 8s early in the season, and 7 1/2s later.
Having stated this, I would not argue much with any of the suggestions you've gotten, and I'm sure they are all based on great experience.
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"Doubtless the good Lord could have made a better game bird than bobwhite, and better country to hunt him in...but equally doubtless, he never did." -- Guy de la Valdene (from A Handful of Feathers )
"'I promise you,' he said, 'on my word of honor, I won't die on the opening of the bird season.'" -- Robert Ruark (from The Old Man and the Boy)
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