I suspect doctors are seeing the use of bullets that fragment (permissible under the St. Petersburg Convention, Hauge Conventions, and Geneva Convention).
Here is some information on the "Dum Dum"
http://website.lineone.net/~dave.cushman/303hist.htmlHere is a picture of the Mark VII which was designed to fragment on impact.
http://www.westernfrontassociation.com/thegreatwar/articles/weapons/303cartridge.htmI suspect that mushrooming is being confused with fragmentation. Unless , of cource ShrubCo wants every civilised nation to be severely anoyed with us (which I doubt).
The only other option is that mushrooming projectiles are being used and they will claim that the Hauge Convention of 1899 does not apply becasue the insurgents have not attempted to or claimed to follow it or have otherwise placedthemselves outside of its protections.
http://www.yale.edu/lawweb/avalon/lawofwar/dec99-03.htm