So 2nd edition will change things up a lot, but here's some advice for now:
If he has a 3+ save on Ironbreakers it's because he's in cover, which means you need to pull him out. You can do this by camping objectives elsewhere on the board or by hitting him with mortal wounds from spells. Alternatively he has a 3+ save from mystic shield, a buff which will be gone next edition.
Also, putting no-rend or even rend -1 units into a unit that has a 3+ save is a usually a bad idea even without rerolls. Use spirit hosts for mortal wounds or utilize some rend -2 attackers.
But the best strategy would be to run hexwraiths through them, causing mortal wounds, then charging the war machines and killing the crew. Throw a grave site in his back field and with some clever positioning you could be bringing dead hexwraiths back into the unit.
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