Years ago I spoke with a park ranger in the backcountry of Great Smoky Mountains national park. He’d run across a wild boar once that charged him. He emptied his Glock sidearm into it as it kept coming at him. It plowed up dirt onto his boots as it came to rest in front of him. He said he was composed while firing at it, but once it was over he was shaking so hard he could barely hang onto his gun.
This sounds like a 10mm backup is needed.
I know a guy who ran backwoods hunting expeditions in Alaska. He carried a double-barrel 12-gauge shotgun for defense against bears.
Why a double-barrel? “Two shots are all you’re going to get,” he said.