12 gauge or .30-06?

I am going bear hunting in September in Bergland unit. The guide I am going with said baits are setup 35 to 50 yards from blinds/stand. I have a .30-06 I am quite comfortable shooting. I also have a 12 gauge that I can borrow a rifled barrel and scope for. Which gun is the better option for bear hunting at close ranges like this.

The first bear I shot with the .30-06 at 30 yards and dropped it in its tracks. Should I consider the 12 gauge or stick with the rifle which I am comfortable with? Thoughts?

12 gauge or .30-06?