Whisk all dry ingredients together in a large deep lightweight bowl. (If you don't have a bowl like this use what you have, and then pour it in a large plastic storage bag)
Drop the drumsticks in one or two at a time. Toss until well coated. Press coating on in spots that don't look like they got sufficient coating. (If using a bag shake, then press)
Place chicken on preheated grill, turn down to low-med, and grill until you just start to see the meat pulling away from the bone in spots.
Serve the grilled chicken drumsticks as is, or with your favorite sauce.