The ornamental design for a buttpad for a rifle, as shown and described.
FIG. 1 is a right side elevation view of a butt pad for a rifle attached to a butt stock of a rifle showing our new design;
FIG. 2 is a left side perspective view of the butt pad of FIG. 1;
FIG. 3 is a left side elevation view of the butt pad of FIG. 1; the right side elevation view is a mirror image of FIG. 3;
FIG. 4 is a rear elevation view of the butt pad of FIG. 1;
FIG. 5 is a front elevation view of the butt pad of FIG. 1;
FIG. 6 is a top plan view of the butt pad of FIG. 1; and,
FIG. 7 is a bottom plan view of the butt pad of FIG. 1.
The broken lines showing portions of the design in all figures is included for the purpose of illustrating environment and forms not part of the claimed design.