dualog 2 bursters, each with 12+ap, set Turn-based combat mode and position your bursters 4 hexes away from most dangerous NPCs in encounter, once its done just go and 1 hex the closest and most dangerous npc, if npc with burst weapon survives, be sure to not stay 1 hex close, step away to 2nd hex after atack. 1 or 2 Superstimpacks might save your ass sometimes, but mostly will be not necesary.
this way you can farm any NPC. NCRA, VC patrols, BOS or even enclave, but preferably neutral or frendly NPC driven factions which do not give bad reputation after you kill them.