I consider myself a decent sniper, but when I go into Crucible, I'm wrecked beyond belief. There are guys who headshot me the very second they scope in. It's -blam!-ing ridiculous! I don't understand how they do it!
EDIT: A lot of people are saying that they get their skill from Halo. However, I actually snipe very well in Halo, but not-so-well in Destiny.
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Here are some tips Aim where you need to be but look elsewhere on the screen to see any threats from other snipers but cycle. Your sights should always be a meter off the ground and hold for body shots, another half meter you will be always at headshot height. Once you have found the balance between head and body height, make sure you strafe to maintain movement and try not to shift the sights higher or lower