Either of the bullets in the calibers you mentioned will work. Black bears aren't all that hard to kill, but you do want something that will penetrate through and through while still giving good expansion. Nosler Partions are a great choice and I will be using them on my bear hunt next week. I hope you have a great hunt.
I'm hunting Saskatchewan black bear May '08 - use your BOW
Everyone I've talked to says that black bear (over bait) is a definite bow hunt. Provided, of course, that one is proficient with a bow (min. 160 lb. draw / 125 grain non-mechanical broadhead).
From what I've researched, many good options on rifle for black bears - 30-06, 7 mm magnum, 300 mag or 300 WSM plenty powerful - should be at least a 180 grain - nosler partition a good choice. I like the Accubond round personally - took down a 1,200 lb. moose in 2004 with one well-placed shot.
Wild boars are like many other (male) wild animals in that they will tangle over the affections of the fairer sex. Nature has however given them some additional padding over the fairer sex to prevent them from tearing each other to shreds. This bony cartiledge is most commonly referred to as the boar's shield. This armor helps prevent the tusks of mature males from penetrating into the vitals of their rivals (usually). I'd heard of such a thing before going on my first wild...