.308 and .30-06 are virtually the same thing in different cases. About 100 FPS velocity difference with like bullet weights. Either one with 165 grain bullets will kill any game you care to hunt. Big bears included. Both can be loaded down with lighter varmint type bullets too.
Your .45-70 will do for wolves if you don't care about the hides. Ditto for anything suitable for Bullwinkle and Yogi. If you're a new shooter, anything with magnum in it's name is too much. Really nothing in North America that needs the velocities(and felt recoil/muzzle blast) magnums produce. Plus shooting a big bangenclanger on a range isn't fun. Means you'll be less likely to practice enough to get good enough to hunt with one.
Your .45-70 will do for wolves if you don't care about the hides. Ditto for anything suitable for Bullwinkle and Yogi. If you're a new shooter, anything with magnum in it's name is too much. Really nothing in North America that needs the velocities(and felt recoil/muzzle blast) magnums produce. Plus shooting a big bangenclanger on a range isn't fun. Means you'll be less likely to practice enough to get good enough to hunt with one.