Heat oil to 375. Whisk together the milk, buttermilk and sriracha sauce. Place shrimp in the milk mixture and allow to sit in the refrigerator, covered, for at least 3 hours. Meanwhile, mix together the remaining ingredients. Now, dredge your shrimp in the dry mixture, shaking off excess and place in the oil. Fry for 2-3 minutes, until golden brown. Watch for the bubbles and when they float to the top but still bubbling then that means they are ready!