Praetorian Foil, but Super Good Advice has almost unlimited ammo against the Oracles. Something about them not really being a target so the gun thinks your missing every shot and returns the ammo right back into the clip. You never have to reload the thing against them. But my raid loadout doesn't let me use them so I use the Corrective Measure. It's amassing how fast they die with it. You can literally solo the Oracles in Hard Mode. Kill 1st one with your primary or secondary. Then switch to your CM and by the last one or two you will have to switch back over. You do need to watch your ammo usage as you can easily overkill the Oracles with it and run out way before hand. 100 round clip [u]Just never ever ever use a hand cannon[/u] against them as they take a(if I remember right) 33% debuff against Oracles.