A Black Bear is a black bear...30-06 will be more than adequate to deal with the largest black. If you're hunting with a guide in bear country I'll bet he's packing some serious bear medicine in case you encounter a brown. If I was on my own in Alaska bear country I'd probably want something beefier for security.
I still have my doubts of the ability of any hunting round to bring down a charging brown after he's decided you're dinner. Personally for that scenario I'd want a 12ga loaded with a mix of slugs and the heaviest gauge buck I could find.
Rather than spend my hard earned pennies on those cool Shoot-N-See targets or even the preprinted targets at sporting goods stores, I save a few bucks for weekend plinking sessions by using paper plates as targets. A 100 count pack of paper plates costs less than a 10 count pack of preprinted targets.
If you are playing with something like a semi auto AK, or building a young shooters confidence with a 22 or shotgun, those big eight inch blanks are perfect for putting holes in all...