That sounds. Horrifying. Functional but also, wtf. Carry something bigger.
Apparently you haven’t investigated the energy of 10mm. And what’s bigger than a 12ga slug? 10ga?
I suppose. It's been a long few weeks and I am not all-there. Yeah, that would probably work. More is better in a situation like that if possible.
https://www.ammunitiontogo.com/lodge/10mm-ballistics/
Consider a 1200 pound sledge hammer hitting you under the chin 6 times.
Then when that does not work, imagine 5 shots of 3” mag slugs at 3100 lbs.
That’s 22,700 pounds of force applied to a bears head.
Their SOP if that fails? Sorry for the partners loss, Run like hell, we got a cocaine zombie bear on our hands.