Lawful weapons of war are covered in the SEVERAL Geneva and Hague accords. In very general terms, ammunition may not be designed to cause "undue suffering".
it specified the rules of war.
After the Geneva Convention where they made the rules of war
The Geneva Convention
The Geneva Convention is important because all of the rules of war were documented. For example, the proper treatment of prisoners of war, no germ warfare to be used and many other rules.
The Geneva Convention establishes the rules of conduct among its signatories.
If you mean Geneva Convention then yes, it does. It violates article 3 of the Geneva Convention making it a crime.
The singular term Geneva Convention refers to the agreements of 1949.
Geneva Conventions
http://www.icrc.org/ihl.nsf/CONVPRES?OpenView First off, there is no "Geneva Convention". The Geneva Conventions (plural) are a series of international treaties. Most deal with the proper conduct of warfare (i.e. the "rules of war"), but there are others which deal with economic issues. You need to be much more specific as to which Convention you are referring to. Also, the link above only show some of the Geneva Conventions on warfare, but not all of them.
It contained the first standing written rules of universal application designed to protect victims of war
"The 1949 Geneva Conventions. The first Geneva Convention protects wounded and sick soldiers on land during war. This Convention represents the fourth updated version of the Geneva Convention on the wounded and sick following those adopted in 1864, 1906 and 1929. It contains 64 articles."
There were it is called the Geneva Convention. It deals with the humane treatment of prisoner of wars.