bang bang shrimp recipe

1 pound large shrimp, peeled and deveined - 1 cup buttermilk - 1 cup all-purpose flour - 1/2 cup cornstarch - 1 teaspoon salt - 1/2 teaspoon black pepper - 1/2 teaspoon paprika - 1/2 teaspoon garlic powder - Vegetable oil for frying