I like my little 30-30 but I prefer my .270 Win. with a 150 grain bullet over the 30-30 slug. I am imperfect so I would rather have a larger round. Baiting is not allowed in my part of the world so setting up on a close range bear mayn't be in the books. Then again, with no bear tag or out of season I have had them within 50 yards. I should note that I normally encounter them while deer hunting.
I consider the 30-30 a 100 yard bear rifle, the .270 Win with 150 grain bullets a 200 yard bear rifle, and the 7MM Mag with 175 grain bullet good to 250-300 yards depending on the location. Of late I have been hunting with the .270 because I failed to get some 175 grainers loaded before the season.
We once, passed a shot up on a large bear down in a very nasty, rocky, steep, and steeper canyon. I had the .270 with me, but in this case the rifle did not matter. It would have taken a SkyCrane to get him out of there. If the shot was not good it would have been a real mess.
P.S. I must admit that during the early part of the season I carried a bolt action .300 Savage with 165 grain Nosler PT bullets. The Crony averages them out around 2630. I mark these rounds as +P+. While there are no signs of pressure in my rifle I am not sure about M99s. I believe that this load and the 150 grain .270 are on a par. The Nosler PT offers better close range penetration over the standard 150 grain .270 bullet which might be more explosive.