I've never been to Maine, and never hunted bear, so who am I to recommend a setup. However, I would think a 10" TC Contender with a 2X scope would be ideal. The single shot can be cocked quieter than a revolver, and if over bait, I presume you will be close. Since I have a 4" S&W 629, I would pack it also, for backup. Otherwise, if I only had one gun, then I would prefer my Ruger 7-1/2" SBHH with a 2X scope. Guess I have an issue with just a single shot and any kind of dangerous game animal when on the ground.