Hollow points in almost any handgun are virtually useless as self defense against bear or hogs. Most of the energy is spent on impact when the bullet expands and limits penetration. This by design and makes for a great home defense round.
9mm is plenty for black bear or hogs but you have to use a solid heay bullet. There are copper options but for the cost I prefer Hard cast lead at 15 to 18 BHN.
Neither HC OR copper will expand. They spend their energy on penetration and breaking large bone.
There is also a reliable source of a fishing guide in AK taking down a brown bear using 147gr HC 9MM from Buffalo Bore. I will try to find the article and add it to this thread later.
If you are carrying HP in your 45 you will have only slightly better results. Stick to heavy solid non expanding type of bullets for woods carry.
***Edit.
If you have/can carry larger than 9mm do it . I carry a 10mm my wife carrys the 9mm. Solid bullet rule of thumb applies to both.
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