The phrase "ammunition types" refers to the different kinds of bullets or rounds that can be used in guns or firearms for various purposes. Full definition
Whereas before you might be forced to switch to different ammunition types, now, it appears as though skills and favorites will fill that role. (pixeljudge.com)
This is ultimately still a gun, which means juggling ammunition types and the like. (vg247.com)
Now, players may utilize a variety of ammunition types, each with a specific strength. (tech-gaming.com)