Do you get two re-rolls per miss? If using laser weapons, do the extra hits caused by lasers also get re-rolled if they miss?

I think it is roll once, then collect hit and reroll misses, collect hits and reroll misses, collect thoses hits, then, roll all of your hits, reroll all of the hits that were hits again and continue until no more hit, basically, it is very devastating if you have a full squad going.

yea just reroll hit every time you have another round of hits or until you run out of models to kill. remember you dont have to keep rolling after you've killed all the models or knocked all the hit points.