Preheat oven to 400 degrees F.
Sift all dry ingredients in a large bowl.
Cut in butter until mix is crumbly
mix in the buttermilk. If you don't have buttermilk you can substitute 1 cup of milk with 1 tsp. vinegar in it.
lightly flour a clean surface, and Knead to form dough. Fold in blackberries. They will smoosh a little, but not too bad
Divide dough in half and form into a circle.
Place one half on a parchment lined cookie sheet and flatten slightly.
Bake the second half on another cookies sheet or in a second batch.
Bake 15 - 20 minutes. Slice each round into 4-6 pieces