This is slightly off from what you are asking, but this is kind of still an answer. I would just use an exotic primary. I've been using a RARE Machine Gun (Bronzed Thutmose-D I believe it is called) and wrecking people in the Iron Banner with it whenever I can get heavy ammo. So I wouldn't worry about an exotic heavy weapon. You might want to use an exotic special... but too be honest your best bet IS an exotic primary more than likely. Been using Bad Juju, Perun's Fire (cause I don't have a Felwinter's Lie), and the Bronzed Thutmose. Been doing quite well. Can almost get the helmet (at Rank 3 at the moment) even though I've now officially missed 2 days of Iron Banner play. lol. Just check my Hunter's K/D over the last 20 matches. :)
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I now have the helmet. :)