Originally Posted by
Rongway
To elaborate on this in case it's not immediately clear, after the first Heat Blast, use whichever of Gauss Round or Ricochet has more charges / less cooldown remaining. Then, alternate after each remaining Heat Blast. That way, you use up the 1 charge that built up in the last two Heat Blasts.
E.g., if you have 2 charges of Ricochet and 1 charge of Gauss Round, it's
Heat Blast (Ricochet) > Heat Blast (Gauss Round) > Heat Blast (Ricochet) > Heat Blast (Gauss Round) > Heat Blast (Ricochet)