I’d take that 280, and never look back. The 6.5 will likely work just fine, also. Since you don’t have a 308 or ‘06 to sling heavies, that 280 and 160s would be just as good. I’m no black bear expert, but I know plenty are killed with 243s and 30/30s, each year…..so they’re not overly hard to kill. From what I gather, moose don’t often know they’re hit…..even if it’s by a Mack truck…..but then, they die fairly quick with most any good bullet in the right place….from 243 on up. That’s at least according to my Canadian guide buds, who should know.