This mod highlights nearby ammo boxes with red contour, visible only to you.
Longer description:
Spoiler!This mod:
Modifies the .object file of the ammo boxes, increasing distance at which they display in high detail from 500 to 1000;
Modifies the .material_config file of the ammo boxes, giving high detail version red contour, making them more visible.
The difference between this mod and Loose Ammo Contours is that the latter only provides options to outline ammo boxes either too close to be of any use (just barely out of pickup range) or from all over the map, which is helpful, but a bit overkill. Sadly, getting in between these two extremes required editing .object file and using .PDMOD format.