Cut butter into 1/4-inch-thick slices.
Place flour, salt, baking powder and baking soda in a large bowl.
Stir to combine.
Toss butter with flour mixture.
Cut butter into flour with a pastry blender until crumbly.
Cover and chill 10 minutes.
Add buttermilk and stir until ingredients are just moistened.
Turn dough out onto a heavily floured surface; knead about 1-2 minutes adding additional flour as needed.
With floured hands, pat dough into a 3/4-inch-thick rectangle (about 9 x 5 inches).
Sprinkle top of dough with additional flour.
Fold dough into thirds.
Add a little more flour and knead again 1-2 more minutes.
Pat dough into a one-inch thickness on a lightly floured surface.
Cut dough with a 2-inch round cutter, and place on greased cookie sheet.
Bake at 450° for 13 to 15 minutes or until lightly browned.
Remove from oven; brush with melted butter.