At Level 71 BST I got 53 Exp from killing this guy. Putting him at EP sort of level, so early 60's. Never once had any problems taking this guy down solo, first time with Homonculus, second time just set Carrie on it.
Both times I have killed this NM were directly after campaign battle when Sandy controlled the zone. 24 hours later I went back and he was there again. No drops though.