I think we are talking penetration, when talking about beg bear defense - both Buffalo Bore and Garrett now make a heavy, hard cast lead bullet that does not have the wicked recoil. These loads are designed to work in the super light 329pd, which I own. I've shot the Buffalo Bore stuff, heavy specials and light magnums, 250 grain Keith style bullet. I have two boxes of Grrett 44 mag defender ammo, 310 grain SuiperHardCast Hammerhead atg 1020 fps - 4 in revolver. Made for use in S&W 329pd, Tarus Titanium and all steel 44 mag revolvers.
Anyone that is concerned about personal protection, or back-up for hunting dangerous game, might look into these loads.
I can hit a pie plate at 25 yards, easily, with the Buffalo Bore and would use these for hog hunting back-up.
I think Randy Garrett's stuff will be even better, and will be controllable for big bear defense, should I ever afford to go to Alaska.