A good ABC will keep fires other than powder & primer based ones from spreading to those fuels, but IMHO that's about it.
This thread has focused heavily on powder & primers as the source, but it's not a bad idea to be prepared for other fires, like electrical, to stop them spreading to the volatiles.
Allan Quatermain: “Automatic rifles. Who in God's name has automatic rifles”?
Elderly Hunter: “That's dashed unsporting. Probably Belgium.”