The ornamental design for ammunition having casing with fins, substantially as shown and described.
FIG. 1 is a perspective view of ammunition having casing with fins in accordance with the present invention;
FIG. 2 is a rear view of the ammunition shown in FIG. 1;
FIG. 3 is a front view of the ammunition shown in FIG. 1;
FIG. 4 is a top view of the ammunition shown in FIG. 1, the bottom view being substantially identical to the top view as shown in FIG. 4; and,
FIG. 5 is a left side view of the ammunition shown in FIG. 1, the right side view being substantially identical to the left side view as shown in FIG. 5.
The broken line showing of portions of the ammunition having casing with fins in FIG. 2 forms no part of the claimed design.