I have seen web pages that mention pellets used in warheads to add the explosive effect. An important point is that all the elements in the pellets are used in explosives. This page does not mention warheads but mentions a lot of the elements the pellets were composed of.....
PYROTECHNICS, PROPELLANTS AND EXPLOSIVES
Fire generators, for domestic use (matches, fuel pellets for field stoves) or military purpose (incendiary grenades).
· Heat generators. Aluminium has already been mentioned as an incendiary metal. Other incendiary metals include zirconium, magnesium, titanium, and depleted uranium. http://imartinez.etsin.upm.es/bk3/c15/Pyrotechnics.htm
Are you willing to say ALL anticraft missiles? How about Chinese? North Korean? Pakastani? Israeli? Cech?
I think your position is reasonable - but there are a lot of potential manufacturers out there. Have you looked at all of them?