Originally Posted by
LimbThief
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You don’t even have to kill your self... you can just beat it for the reward and or money, then go to the objectives board and relaunch it.
But to answer your question it just takes time. After a while... a long while, all the drops will eventually turn 250.
What can speed up the process is rolling weapon rarity at 250 for all 3 slots and/or equipping weapons rarity and equipment at 252 from elite faction missions, but even then world drops may still be 249 for a while.
And if you’re into it... raid.