Depends on who you ask. 'They' consider a .44 Mag a minimum, unless it is the other 'they' that consider 12g minimum, or possibly the one brownie guide who reportedly carries a .357 loaded w/ 180s as a backup. Oh, then there's the ones who call anyone who carries any handgun an imbecile, and the few who believe they can put enough lead into a brown bear with a .45ACP that the thing cannot keep running towards them.:jerkit: :foot:
The .44 is fine w/ 300g hardcast loads. He can buy the ammo at most any gun shop up there. Knowledge of bear behavior is much more important than the gun though. Without knowledge, no gun is probably best. Stainless is MUCH better than blue.
Some guys up there really like the chest rigs. I don't know anything about them myself. You can buy those up there too at the Sportsman's Warehouse and some gun shops. At least you could. I will look for a link for you.
There you go.
http://www.alaskasportsmanproducts.com/ I don't know anything about these myself. Just in case you can't tell from my post, I am not an eggspurt.