The 4.6×36 mm is a cartridge developed by Heckler & Koch for its experimental HK36 assault rifle of the 1970s. When the rifle was not taken into service by any military force, its ammunition was not used for any other weapon design. The main feature that set the bullet apart from its contemporaries was the use of a so-called "spoon tip" (German: Löffelspitz): the tip had a concave area on one side which was intended to make the bullet "tumble" after hitting a target, in order to give it greater stopping power than such a small, high-velocity bullet would otherwise have.