Hey if he wants to use a cannon have at it, as long as the bear don't run too far;) Dead is Dead right. Use what you are comfortable with and shoot the best, I would not use anything less than a 30cal either,as far as I'm concerned,when hunting bears. Shot placement is No#1, there has been bears that have got there leg shot off from a bad shot, and the bear still gets away, you would be surprised how good a three legged bear can run, ashame the suffering the animal has to go through, thats why I say practice and more practice, be confident in your self and your shooting skills, even before you ever think of hunting any game, that is one step in the right direction. Remember there is never too much gun when hunting big dangerous game. Aim small hit small. RAMbo.