7mm mag will do it.

Actually for black bear most any decent sized cartridge, 30-06 etc.

338-06 would be better for bear.
Good hog round too.
You can shoot from 160 gr up tp 300 grainers.

30-06 you can shoot from 110 gr up to 250 grainers if you have the twist.

For the big and nasty stuff, I agree with above and go for a 375 ruger or better yet a 416 ruger.