Just got Rapid Fire for my mag what's the best ammo?

What's up guys so I just got rapid fire from the eX Cube shop and was wondering what's the best ammo type that does the most damage? My mag has Dark blast round at the moment ?

@ErK18e7 Rapid Fire is a "Special Auto Action" of a mag, this is independent from the mag's regular auto action. The power of special auto action is the same regardless of the choice of its regular auto action. So you don't have to worry much about that.

How much damage they do would really depend entirely on the elemental weakness of the enemy you happen to be fighting.

@zaffy2005 500 to 600 but my other mags tec ice skill does 5000!?