The way I understand the Geneva/Hague treaty(whatever its called) works is that it applies to countries who have signed it also, that's why our military uses hollow-point ammo in 7.62 and 5.56 in Afghanistan now. Being that his friend was part of a security force there would probably be less restrictions than if they were in a conflict/war and using rifles chambered in the 270 win cartridge(which is not a military round) would also indicate the lack of restrictions imposed plus I doubt that anyone, even the military, loads up the 270 with full metal jackets to be used in tactical applications so they probably had to turn to a commercial company such as Federal for ammunition.
Dave