Adrian,
Wow, that is quite a claim. How did your coastal brownie, polar bear, and interior grizzly measure out? Africa?

James,
While one may find it difficult to find a guide to stand by you on Kodiak or Afognak going after brownies with a 270, you are correct that having a magnum designation is not necessary. There are many fine non-magnum cartridges out there for the "bigger" big game in North America": 338-06, 35 Whelen, 416 Rigby, 45-70 to name a few.

EKM