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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It's a Halo thing. A lot of people follow the target but only do that if you sweep. For the most part, what you really want to do is place your scope on where they're heading next, it's prediction at work.