BEST METHOD TO FARM BOUNTY POINT (OFFLINE)
For this method we're gonna play in Easy mode to make things faster, we'll start from Remnant Wasteland, Extinct Civilisation City.
We're gonna loop the HNM at the Central Town using a Sniper Rifle, making him respawn infinitely and earning 5000 Bounty Points for each kill.
For a detailed walkthrough on where exactly to go and how to make him respawn efficiently check the video below to make things easier to understand.
PS: We're doing this in easy mode since you'll earn 5000 Bounty Points in both easy and normal mode, 10000 on extreme mode but you'll hardly kill him in one hit that way.
For a detailed walkthrough check the video blow: