I done the bounty not long ago, I took a but of advice and waited for iron banner then went into normal crucible, the reason for this is because when iron banner is available most of the high level players are in there because all level advantages count, in crucible it's only perks on weapons that make any difference as its been explained to me, anyway here is how I done it, I went into crucible with my warlock, voidwalker class on so your super, melee and grenades count to void kills, I used word of crota, plug one.1 fusion rifle and corrective measure from the VoG, at the start of the game I would help capture the closest control point then hang around that point and wait for the enemy to come to me