In a large bowl, sift the dry ingredients together. Add the butter and mix it into the flour with your fingers. Add buttermilk and knead into a soft dough. Knead in the raisins.
On a floured board, roll out the dough until 1/2" thick.
Cut dough into 16 rounds. Place on a baking sheet and bake for 15 to 20 minutes, or until golden in color.
Serve warm or let cool and store in an airtight container.