DaleK - As I am sure everyone on this board knows, any of the calibers mentioned will kill a bear with a good bullet (TSX, Accubond, TBBC, Partition) placed in the right place. None will make a significant difference if the bullet doesn't go where it is supposed to. Also, your concern is surprising a bear at close quarters; none of the calibers mentioned will stop a charge from a huge bear. My advice; use a .458 Lott.
