If you drive a bullet faster than what it's designed for, it will blow up. I'd say that (the caribou) was more a case of "pilot error" rather than the bullet failing. I had a Speer 400 grain, .458" JSP blow up badly on a deer, out of my Marlin 45-70. Having succumbed to "magnumtitus", I was driving it way over what it was made for. But I really didn't think a big chunk of lead like that, going under 2000fps, (I think I had it loaded to 1700fps, but I forget) could blow up. !! That was my fault, not the bullet's.
I also used to load my 7.7 Arisaka carbine, 16" barrel, real hot. (with bullets designed for the 7.7/.303/7.65) From the short barrel they worked pretty good. Then I picked up another Arisaka with the full length barrel. From the long barrel, those bullets blew up badly on deer and coyotes.
I think any bullet will work well, if it's loaded intelligently, and at velocities the bullet was intended for. Even the Nosler Magic Bullet. "NPMB"
But I'm really not trying to pick an argument with anyone over the .300WinMag. I just thought it was more exciting to pick a caliber with a little more "cool factor" than a .300 mag. Never suggested or implied that one needed a bigger cartridge, and I'm not really seeing where others have. I think there
has been some confusion between "hunting grizz" and "hunting in Grizz territory" (I frequently hunt in a Grizzley Recovery Area) (with a flintlock)(GMU113 in North Eastern Washington state)
I still think the Nosler is not a magic bullet, and absolutely grossly over priced. However, since I've never lived in Alaska, that opinion is..."canceled"?? And, I'm not sure how my dislike of the NP makes it obvious that I don't know how it works. (oh wise one...!!
) Believe it or not, one
can understand how it's supposed to work, and
still wonder why people spend mega-bucks on them. But, just a poor ignoramus am I.
As Festus once said, the things I don't understand would fill a good sized barn.