Niu Hsing is mostly data deliveries, but also cargo. Nothing thrilling, but still better and more lucrative than donations. Dunno if there are kill missions, if there were my brain filtered them out automatically, as they take longer and therefore the ranking as well.
Lol I might stop by on the way to Maia to re-engineer my FDLs engines, in my DBX.
Last time I spammed data delivery missions, I lasted a full hour, before getting incredibly bored and returning to normal activities.
Col 285 was fun, because I could earn good money, while ranking, and while enjoying myself. Even if it wasn't the most efficient method, the fun/money/rank ratio was pretty good. Although endless pew pew does lose its charm after several hundred, possibly thousand kills. Lol