Missing has nothing to do with it. Increasing the recharge rate of ammo by nearly 50% is a big nerf. If you use ice breaker in pvp and start sniping early you will find yourself out of ammo after 1 or 2 kills even if you hit both headshots. In pve when sniping a boss the ammo does no last. Saying that not missing makes it easy to have ammo is false as it takes 42 seconds to recharge a clip that you can empty in 10 seconds.