Cut butter into flour, sugar, baking soda, baking powder and salt in large bowl, using pastry blender or crisscrossing 2 knives, until mixture resembles fine crumbs. Stir in raisins and just enough buttermilk so dough leaves side of bowl.
Turn dough onto lightly floured surface. Knead 1 to 2 minutes or until smooth. Shape into round loaf, about 6 1/2 inches in diameter. Place on cookie sheet. Cut an X shape about 1/2 inch deep through loaf with floured knife.
Bake 35 to 45 minutes or until golden brown. Brush with butter or margarine, softened, if desired.