The ornamental design for an ammunition side saddle, as shown and described.
FIG. 1 is a front perspective view of an ammunition side saddle showing the new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a side view thereof;
FIG. 5 is a side view thereof opposite that of FIG. 4;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a perspective view thereof showing the ammunition side saddle in a use configuration with environment.
The broken lines depict portions of the ammunition side saddle that form no part of the claimed design. The broken lines in FIG. 8 depict environment of one round of ammunition that forms no part of the claimed design.