I need recommendations for a bear home defense round. Yes, really.
I don't want to get too into specifics because it's always amazing how little info Reddit needs to dox someone.
Bear sightings are rising (after decades of no evidence at all) in my area. I live in an isolated area in a small cluster of houses. Next to our small clearing, there's woods/creeks/ravines that lots of animals treat as a highway to avoid humans and then often pop up through our yards to cross over into the next ravines. Given the combination of very old humans, very young humans, and a big mish-mash of pets that all spend time in their yards, I have concerns about my neighbors being outside, not realizing they got between a cub and mamma, and not being able to get back in the house fast enough to avoid an attack. I'd like to have a rifle/carbine/SBR/whatever in a lockup next to the door that could be grabbed in a hurry if a bear is spotted. If the bear wanders off on its own, live and let live. If the bear thinks one of the grandmas living next door or one of their great grandkids needs smacked around and gnawed on, well, then I'd like to be able to do something more useful than throw a rock.
I'd prefer (though it's not required) a round that can easily be built into an AR upper just to reduce what I need to buy. If there's no such thing, then either a semi-auto or a bolt/break/lever-whatever action is fine. Longest realistic shot would be 75 yards. If bear is any farther than that and it's not in our little clearing and not a threat to anyone. This is for eastern black bears. Yes, I know having a black bear attack is very uncommon but it does happen and my neighbors are unusually unable to do anything about it if it does happen.