Preheat oven to 375 degrees.
Using food processor, grind 1 cup of oats until they become a fine meal. Put the other cup of rolled oats aside.
Add whole wheat and all-purpose flours to processor bowl, along with 1/4 cup sugar, baking powder, baking soda, and salt. Use 3-4 on/off pulses to blend mixture well.
Add chopped butter to bowl and use on/off turns to cut it into the dry mixture until it looks like coarse meal.
Transfer this mixture to a large bowl. Stir in the raisins and remaining cup of oats.
Create well in center of mixture and stir in enough buttermilk to create a soft dough.
Turn the dough onto a floured surface and knead gently, turning dough with each knead, a total of about 10 times.
Divide the dough into 3 pieces.
Roll each piece of dough into a round about 3/4-inch thick. Cut the circle into quarters and transfer the wedges of dough to a baking sheet.
Brush each wedge with half and half and then sprinkle with turbinado (or granulated) sugar.
Bake until golden brown, between 25 and 30 minutes.
Serve hot.