Ok so I was just doing the daily vanguard bounties (completed 5) and turned them all in. But instead of turning them in slow I spammed the a button and got an exotic bounty. Now your wondering its only 1 bounty take a break, I did this multiple times and got an exotic 100% Its the vanguard bounties you have to do to get a better chance. So just spam the A or square button when you have 5 completed. This is my third one from doing this so you should try it. Comment if you did do this and tell me your results.