The ornamental design for a “game loading device,” as shown and described.
FIG. 1 is a perspective view of the game loading device, showing my new design;
FIG. 2 is a right side elevational view of the game loading device;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a front elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a perspective view of the game loading device illustrated in FIGS. 1–7, with a vehicle shown in broken lines for environmental purposes only and not forming part of the claimed design.