Preheat oven to 375 degrees. Line a baking sheet with a silpat or lightly grease.

Combine flour, sugar, baking powder, baking soda, and salt in a large bowl. Using your hands, mix in the butter until the mixture resembles coarse crumbs. Stir in raisins and buttermilk until the dough is evenly combined.

Turn dough out onto a clean, lightly floured work surface and knead until smooth, approximately 2 minutes. Shape dough into a ball and place on the baking sheet. Cut a cross on top of the dough, approximately 1/4" deep.

Bake for 30 to 40 minutes, until golden brown.