A 308win or 30-06 are great but no heavier than 180gr and a partition for the lighter165gr bullet.

The 338fed/358win/35rem are all great andblack bears are not hard to kill but bigger bullets work better and high velocitiesare not required either. The 35rem with buffalo Bores 220grSpeer @2200fps is prefect and so is the 336marlin. The 308win with a plan old 180gr corelokt round nose id prefesct as well and in a rem 700 bolt or Modle #7 with a 20 inch barrel great. Ruger offers both the 338fed and 358win which are bot neck up 308 cases. And no 3-9 scopes either thats to much magifacation a 1-4 or 1.5-5 is perfect a 2-7 is at the hi end ofmagnifacation. And yes all these will work too 7mm08 280rem 270win 260rem.