Stubble,
I've shot a lot of big game with all of the calibers you mentioned, includeing big bears. I've seen my self a 7 Rem. mag with 175 Nosler partitions break both shoulders on a big bear, now could you explain to me how a 300 Win. mag. will do better than that?????????????? Have you seen a 7 mag with 175 NP's fail on big bears????????????
I've seen a 378 Wby. fail on a big bear, from poor shooting!!! And i've seen a 30-06 work on a brown bear, so what am i do choose????????????
Bottom line is, a properly loaded 7 Rem. mag will kill a brown bear as dead as a 300 Win. mag, or the 338 mag., and just because you feel you can't do it, doesn't mean it isn't enough gun to handle the job.
Robert