Well living in Alaska with the bears, you should know that 90% of their diet is vegetation (bears being closer to the herbivore side of the spectrum than carnivore). When they do prey, it is largely on spawning salmon along with the occasional young elk, deer, or caribou. Perhaps there have been examples of a brown bear eating its young (I can't find any), but this whole "they eat them like candy" nonsense is bull-honkey.
Would you care to approach a zoologist with your "Size is all that matters to a predator" hypothesis and your "Brown bears eat brown bear cubs like candy" theory?
By the way, there are an average of two fatal bear attacks each year in North America, and the majority have been due to the stupidity of the humans involved, so I wouldn't bother with the gun unless you feel like invading the bear's space.
http://www.absc.usgs.gov/research/brownbea...n_conflicts.htm
But please, feel free to disrespect this knowledge because I'm not from Alaska and I clearly have no idea what I'm talking about.