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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If I'm ever sniping I remember where the arrow shows up when sprinting. Use that as a guide to where my scope will end up and line up my shots before I'm even scoped in. Works pretty well. Most quick snipes are bs quick scopes or panicked final rounds though lol.