Fatebringer, Blackhammer, and Gjallarhorn
These are what make up the best Loadout in Destiny. Of course this is my opinion, but each of these literally are in a class of their own. This is for PvE of course.
If you do not own any of them, I apologize as there was not enough room for it as a choice.
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Your opinion is slightly flawed, save black hammer for special bosses. The rest of the time you need a sniper with surplus so you get more rockets for your ghally per heavy ammo pack. It will go from 2 rockets per to 4-5 per.