308 should work just fine. That's completely up to you.
What distances your comfortable shooting and all that.
I can say that most areas that have the most bear are thicker than dog snot. Comparable to the thick stuff your used to.
That's not to say ,you may find a bear at longer distances.
You may want a different rifle,kinda depends on what hunting you want to do and all that.
Berry crop
Really depends on how much rain we get in May - June.
Some years have more Berry's than you could ever pick.
Other years you'll be lucky to pick a handful.
There is no guaranteed Berry crop. Spotting, glassing, closing the distance is pretty much key.
Seen you said your ok with the cold,half the bear season,will be dry and very hot,lots of bee. Very well certain parcels of land can also be closed to hunting during early bear season,while it's fire season.
That's all I really can say on the open forum.
Good luck out there 👍