I claim the ornamental design for a handle grip for rattling antler, as shown and described.
FIG. 1 is a front and bottom perspective view of a handle grip for rattling antler, the handle grip for a rattling antler secured about a main base of an antler;
FIG. 2 is a front and top perspective view of the handle grip for a rattling antler;
FIG. 3 is a front elevation view of the handle grip for a rattling antler;
FIG. 4 is a rear elevation view of the handle grip for a rattling antler;
FIG. 5 is a side view of the handle grip for a rattling antler;
FIG. 6 is an opposite side view of the handle grip for a rattling antler;
FIG. 7 is a top plan view of the handle grip for a rattling antler; and,
FIG. 8 is a bottom plan view of the handle grip for a rattling antler.
The broken lines depict environmental structure and form no part of the claimed design.