Admittedly, not all anti-materiel rounds are explosive or incendiary (by the way, official spelling is anti-materiel, not anti-materialRahul M wrote:thanks.
are all rounds of anti-material rifles explosive in nature ?

As you can see, policies do change from time to time, so what was taught in the 80s is not necessarily taught now.
From http://en.wikipedia.org/wiki/Raufoss_Mk_211#LegalityThe official stance of the Norwegian Government is that the 12.7 mm MP round should not be used against personnel, but an exception has been made for snipers using the round - due to the practical limitations of snipers having to change the type of ammunition used when switching between hardened and soft targets. It is being exported strictly in an anti-materiel capacity. The current U.S. policy is that the ammunition is suitable for use against all targets.