In a large bowl, mix together garlic powder, black pepper, 1/3 cup Worcestershire sauce, wine, and salad dressing; add shrimp, and toss to coat. Cover, and marinate in the refrigerator for 1 hour.
Preheat grill for high heat. Thread shrimp onto skewers, piercing once near the tail and once near the head. Discard marinade.
In a small bowl, stir together honey, melted butter, and remaining 2 tablespoons Worcestershire sauce. Set aside for basting.
Lightly oil grill grate. Grill shrimp for 2 to 3 minutes per side, or until opaque. Baste occasionally with the honey-butter sauce while grilling.