Although not as well versed as some on this site, I can say I have not seen much difference in killing power between the bears-both brown and black- that I've shot with my 308, and those that I shot with my 300win and 375. With all due respect to opinions on this site, the moose I have broken down have had thicker hide and ribs than the bears I have shot and have seen shot, and many of those have been with 243, 270, and 308.
It used to amaze me what folks would hunt with around here...a lot of 223s, 22-250s, 243s, 270s, 30-30s, and 30-06s. At one point I was told that you couldn't swing a cat without hitting a 270 around here; I would agree. I know- and some on this site know- a well-versed hunter on the south side of Iliamna Lake that has hunted most of her life with a handed down .300 Savage.
As has been said, good bullets put in the right place are what do the work.
