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Place strawberries, 1/3 cup powdered sugar, and juice in a small bowl; toss.
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Preheat oven to 425 degrees.
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Lightly spoon flour into dry measuring cups; level with a knife. Combine flour and next 5 ingredients (through salt) in a large bowl, stirring well with a whisk. Cut in butter with a pastry blender or two knives until mixture resembles coarse meal. Add buttermilk, stirring just until moist.
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Turn dough out onto a lightly floured surface; knead one or two times until well blended. Pat dough ino a 6x4 inch rectangle. Cut dough into 6 2-inch squares; sprinkle evenly with turbinado sugar. Place squares 1 inch apart on a baking sheet coated with cooking spray. Bake at 425 degrees for 13 minutes; cool on a wire rack.
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Place whipping cream in a bowl; beat with a mixer at high speed until soft peaks form. Add remaining 2 teaspoons powdered sugar. Continue beaking until stiff peaks form.
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Split shortcakes in half crosswise. Place 1 bottom half of cake on each of 6 plates; top each serving with 1/2 cup strawberry mixture. Spoon 1 1/2 tablespoons whipped cream over each serving. Place 1 top half of cake over each serving.