Don't make the same mistakes we made our first go around. It is absolutely POSSIBLE to get 280+ with your first playthrough as long as you do the activities in the right order!
Btw, huge shoutout to Kujayhawk47 as he is the one who created this entire Guide. I am merely the man with the camera. You can reach him on Twitch @kujayhawk47
https://www.reddit.com/r/DestinyTheGame/comments/6ywz57/the_road_to_max_power_in_destiny_2/
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I figured it would be possible, considering that I'm already around 210-215 without even finishing the campaign. New gear drops like crazy, you're getting better gear every two minutes. I've even had guns that I never even used because I got something better so fast.