I'm kinda confused on the text for Explosive Weapons vs. Hordes. It says that explosive weapons generate 1 additional hit (kinda like a power weapon). Does that mean per attack (i.e.single, burst, full auto) or per bullet hit (i.e. essentially giving bolters the storm ability against hordes)?
Now the confusion comes with the Unrelenting Devastation, which specifically mentions that you do additional 1 magnitude damage PER HIT, rather than just 1 ADDITIONAL HIT.