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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Finding a scope you really like is the main thing, most people go for the Ambush SLH25 (Second lowest zoom scope in the game) But for some reason on my old style FWC 'The Chosen' sniper that has a Tacsys SLS15 scope I can do really damn well with it, generally find a scope you like and stick with it.. That's what I've done and it's worked:)