Preheat the oil, in a large Dutch oven, to 330 degrees F. Immediately before frying, dip the chicken legs and thighs (dark meat) into the flour mixture, the buttermilk and then the 2nd flour mixture. Fry 10-13 minutes until golden brown, and the internal temperature is 175-180 degrees F. (The temperature of the oil will decrease so adjust the heat to keep the oil at 325.) Place only 3-4 chicken pieces in the pot – do NOT overcrowd the pot. The chicken will be cooked in batches. When chicken is c