With party + food + potion + DRG piercing debuff its "easy" to keep 1.1-1.2 if You have around 185-187 ilvl and Weapon 190 during 2.4 minutes

I said "easy" because RNG during no ammo can destroy your DPS, It's not the common , but shit happens.

MCH has the highest opener I have seen far away, BLM is close with Foe + Battle Voice.