The ornamental design for an attachableshootingrest for a walking stick, substantially as shown and described.
FIG. 1 is a front right side perspective view of an attachable shooting rest for a walking stick according to the present invention and shown in an exemplary environment attached to the top of a walking stick;
FIG. 2 is a front right side perspective view of the attachable shooting rest for a walking stick shown in FIG. 1;
FIG. 3 is a front side elevation view thereof;
FIG. 4 is a rear side elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a right side elevation view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines show environment that forms no part of the claimed design.