Weston, from G9 Defense here. I strongly recommend our 124gr +P Woodsman in this context. If a 9mm is what you have, absolutely carry it over bear spray or nothing. Oddly enough, projectile was initially designed by request of a Scandinavian gov agency that need a 9mm round capable of dispatching a polar bear. If you're going to use any pistol caliber for bear defense, you should choose a product that not only penetrates deeply without deformation, but leaves a wound channel the whole way.
Traditional hollow points (when they open as designed) might create some wounding on target, but only in the first couple inches. When going through heavy hide or bone, a hollow point will most likely clog or deform causing it to pencil through just like an FMJ. Heavy hard cast is capable of deeper penetration and overcoming bones. However, penetration alone does not stop a threat, unless the round breaks down a critical bone, has a good hit on vitals, or penetrates the CNS.
Our 9mm +P Woodsman has been shown in third party testing to penetrate 34" and leave a 13.1 cubic inch permanent wound cavity in ballistic gel. The penetration exceeds FMJs and the wounding drastically exceeds hollow points. This gives the best of both worlds to make 9mm a legit bear defense caliber. BUT, if you're hunting in grizzly country year after year, I'd still save up for a 10mm.
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