Whisk together the mango nectar, lime juice, honey, garlic, oil, garlic, cilantro, salt and chipotle chile powder. Toss in the shrimp and allow to marinate in the refrigerator for at least 30 minutes. Preheat grill to medium low and thread shrimp onto metal skewers. Lightly oil grill grates and grill shrimp, 3 - 5 minutes per side, basting with the marinade frequently. Remove shrimp from skewers to serve.