That box of Winchester is not M193
NATO spec ammo will have the cross and will say M855 5.56 or M193 5.56
ETA I am not familiar with Ultra Max ammo, however it says .223 on the box. If it was realy 5.56 NATO it would say it on the box. If the brass has the NATO cross and and says LC on the heatstamp then it is probably remanufactured ammo, like Blackhills or Georgia Arms.