To make dough: In large bowl, combine 1 1/2 cups flour, 2/3 cup sugar, undissolved yeast and salt. Heat butter, milk and water until very warm (120 to 130?F); stir into dry ingredients. Stir in eggs and remaining flour to make soft batter. Cover; let rest 10 minutes.
To make filling: In small bowl, combine 1/3 cup sugar, 1 tablespoon flour and cinnamon; stir in blueberries. With spoon, stir batter down and beat for about 30 seconds. Spoon half the batter into greased 12-cup fluted tube pan; top with blueberry mixture. Spoon remaining batter evenly into pan. Cover with greased plastic wrap; let rise in warm, draft-free place until doubled in size, about 30 to 45 minutes.
Bake at 325?F for 50 to 55 minutes or until done. Cool in pan 5 minutes; turn out onto rack to cool completely. If desired, sprinkle with powdered sugar.
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