Yea, that came out last Feb and was discussed here.
Sort of varies his previous article.
And in another article in his tech section there's the points I made earlier.
"Stopping" bears with handgun or rifle cartridges
www.buffalobore.com
Excerpt.
GRIZZLY BEARS
First, not all bears are the same. Grizzly bears have a much different mindset than the black bear species. To stop a grizzly attack, you will PROBABLY have to kill it, but sometimes all you have to do is to hurt it badly, and the bear will become dissuaded. So, when planning to stop grizzly attacks, it is best to use a cartridge that will kill it—the quicker, the better. Interior grizzlies normally get no bigger than 500 lbs, but in Montana, I’ve seen interior bears around 900 lbs., but this is very rare. Coastal grizzlies, sometimes known as Alaskan Brown Bears, often exceed 1000 lbs.
> If you are relying on shoulder or
heart/lung shots to kill such a bear, it takes a lot of cartridges. One that will make a big hole that goes very deeply through bone and into internal organs. If you hit him fatally in the chest area, you will then have roughly 15 to 30 seconds to stay alive before the bear learns he is dead.
> If you are relying on
brain shots, it is not all that hard to kill adult grizzly bears. Almost any center fire cartridge of 357 bore or larger with a very hard, non-expanding, flat-nosed bullet will pierce a bear's skull with direct /frontal (between the eyes) hits. From the side angle, shoot them right at the bottom of the ear canal. These two shots are instant death if you are using the correct ammo.
The old MYTH that bullets will slide off a bear’s skull is pure hogwash when using modern ammo featuring bullets that will not mushroom when fired from a powerful handgun. When using high-powered rifles, it is OK if the bullet mushrooms as the high velocity of the rifle bullet, will puncture the bear's skull regardless because of its high velocity. One hundred fifty years ago, when the early settlers were heading west, the muzzleloaders they used fired pure lead (very soft) round balls that would or could flatten out against bone and possibly slide off, leaving only a surface wound when hitting a bear's head. Unless you are using pure lead bullets that are rounded, this situation is no longer a concern.