Yep, it is actually against the laws of war (that is an oxymoron in itself...the act of war is anything but lawful) that disallow the use of any projectiles that are not jacketed to prevent against splintering. In other words, your standard NATO or Soviet round would leave a clean wound. Even your standard lead hunting catridge is against the rules of the Geneva Convention....they are perfectly fine for hunting deer, but not for use in war.
It's basically trying to civilize that which is not civilized...
There is a scale in war acts; the dirtier you fight it, the more likely the other side will do it too, and you end up with a lot more atrocities and harder it is to convince the other to end the war. There are clean wars where only war targets are attacked, prisoners treated fairly, no ransaking, no women harmed and no dirty weapons used... But the more casualties there are, the less civilized it gets.