Prepare the grill, set heat to medium high.
Combine all the seasonings for your dry rub, then sprinkle it generously inside and on the outside of each hen. Then prop each hen up by placing the half full can of beer inside the cavity.
Grill for about 40 minutes, checking periodically. Use a sharp knife to slice between the thigh and breast - if the juices run clear it's done. If not, continue to cook in additional 5 minute increments until the internal temperature on an instant read thermometer reaches 180°F when inserted into inner thigh.