A bear set on kill mode will have adreneline and testosterone oozing through every pore of his skin.
Not unless it's cranked up on bath salts! And where in this thread did anyone suggest using buckshot?
The OP has a legitimate concern for his and his family's safety. I'm sure if 1+ ounces of hard cast slug from a 12 guage are the preferred load from the folks that actually dispatch these animals on a regular basis then it's probably wise to follow suit.