Explosive

Explosive ammunition explodes upon impact, transforming chemical potential energy into explosive kinetic energy.

Explosives are almost always more powerful the closer a target is to the center of its blast radius in Fallout 3. This blast radius is known as the Area of Effect, or AOE.

examples of explosive ammo are most common rockets and in some opinions the ammo used in combination with tesla cannon and ofcourse the mini nuke which get shot away and not thrown like a grenade.