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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I got used to sniping but ive seen people put a tiny piece of paper with tape on their screen right where the scope will zoom in, once you memorize where the middle of the screen will be after practicing with the tape you then take off the tape with paper and you will see a great increase in your "quickscoping" skills