easy way to get 310 exotic weapons and armor

First thing you want to do is make sure you are over 300.
Then you want to use the three of coins that you get from xur.
Then go to missions that have ultra there the one's with the skull by their health, the easiest place place that I have found do this is the scourge of  winters mission on Venus and the eye of a gate lord mission on Venus.
Most of the drop you should get will be 310 and the higher the light level you are the higher the chance of getting a 310 Exotics.