Sniper ammo and Heavy Machine Gun ammo have been reduced to increase the play time required to complete activities. Bungie is pulling out all the stops to keep players playing their game. You will no longer move through activities at the same pace. This isn't the 1st time Bungie has done this either. Bungie changed Black Hammer, IceBreaker, and Gjallahorn back in year 1 for exactly the same reason. Not enough content so Bungie wants what little content there is to take as long as absolutely possible to complete.