Mix all dry ingredients in a large bowl
Add in cubed butter and cut into dry ingredients until small pea size clumps form.
In a separate bowl whisk together buttermilk, 3/4 heavy cream, and egg.
Make a well in your dry ingredients and pour in milk mixture into the center.
Using a fork gently mix together. Do not over mix.
Turn out mixture onto a lightly flour surface and gently knead the dough about 4-5 times.
Sprinkle blueberries over half the dough and fold it in half.
Roll out into a circle about 6 inches wide.
Fold dough in half and then half again.
Roll out into a circle about 1 1/2 inches thick.
Using a knife or pizza cutter, cut dough into 8 wedges.
Place onto a lightly greased baking sheet.
Brush each scone with a little heavy cream and sprinkle with sugar.
Bake at 425 for 15-18 minutes or until lightly golden brown.
Cool 5 minutes before serving.