Preheat oven to 425°. On a floured surface, roll dough to fit a 9-in. pie plate. Trim and flute edge. Refrigerate 30 minutes. Line crust with a double thickness of foil. Fill with pie weights. Bake on a lower oven rack until golden brown, 20-25 minutes. Remove foil and weights; bake until bottom is golden brown, 3-6 minutes. Cool on a wire rack., In a saucepan over medium heat, combine sugar, cornstarch, salt and water until smooth. Add 3 cups blueberries. Bring to a boil; cook and stir for 2 minutes or until thickened and bubbly., Remove from the heat. Add butter, lemon juice and remaining berries; stir until butter is melted. Cool. Pour into crust. Refrigerate until serving.