Combine dry ingredients. Add sourdough and 4 TBLS melted butter and mix. Butter skillet with 2 TBLS butter. Shape dough into egg size biscuits and place in a cast iron skillet. Brush with 1 TBLS melted butter. Cover with a dish towel and allow to rise about 10 minutes or so.
Preheat oven 350*. Bake 30- 40 minutes, until golden brown. Remove from oven. Brush with remaining butter. Serve warm with butter.