I've been running the Recluse Endangerment and other bounties since the weekend, but I'm having real trouble getting any of them to progress. I've tried running it in Onslaught, running it against more powerful enemies (except Guardians), using it in Master Dungeons, but progression doesn't happen.
The first bounty I did for Elsie's Rifle probably took five Onslaught Playlist runs, but now I'm DAYS into doing this and progression seems to be 1% for every 30 enemies I kill; most of which only seem to be precision shots simply to get the progress bar to move...
I've read from some users that the bounty resets if you die, but I haven't seen evidence of this and it doesn't indicate that in the bounty rules.
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Try Shuro Chi or the beginning of Grasp; that's how I finished mine pretty quickly.