I too subscribe to the big and slow school for black bears. The problem with the inevitable "I killed a 1600# grizzly with a .20 cal spitball" stories is that they ignore tracking. When my daughter gave bear hunting a try in 2020, I bought her a .308, but she had little time on it, so she took the .243 instead. Knowing it was on the small side, I got her some nice Nosler partitions.
When she shot (11 yards), the bear ran off and quickly expired, about 40 yards away. The round passed through, but as I had feared, we had no blood trail. Its the same reason I upgraded from .308 to .338. The .308s kill just as well, but they don't bleed as well.