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Daswig:
A good controlled-expansion round from a .41 Mag or greater pistol round will most definitely penetrate the skull of a Grizz. Buckshot is much smaller, lighter, slower, and carries less kinetic energy.
Hollowpoint rounds designed for anti-personnel work should most definitely NOT be used, as these will fragment upon contact and will not instantly incapacitate the bear. However, a Barnes X-Round or other suitable heavyweight CE round will do the trick.
A "standard solid" ball-round will not transmit sufficiant energy to instantly kill: a Kodiak about 18 months ago took 7 shots from a 7mm H&H Magnum, including two consecutive headshots, and did not go down: this was later attributed to the fact that the non-expanding rounds did not destroy enough brain tissue to kill instantly. A good expanding round or large-diameter Monolithic Solid is what's needed here. ( "Large-diameter" here means .44 on up. Anything smaller needs to be the hottest CE round you can find ).
My Uncle Robert guided Bear and Caribou hunts in Alaska and BC for 8 years and I contacted him before replying to this. He's dropped 5 Grizz in his days, all with largebore handguns or rifles firing CE and Mono. Solid shot. He won't even touch anything else.
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