In 2001 I was grizz hunting in the Talkeetna Mountains of Alsaka. I shot a grizzly (650lbs) at 30 yards, on a dead run at me. I had a .338 ultramag with 250gr A-frames. We watched the bear from about 500 tards chase a herd of 8 caribou back & forth through a meadow. After 4 chases, the grizz gave up & started moving uphill. We took off & got about 300 yards away when my guide blew a predator call. The bear saw us but the wind was in our face. It came running for "chow time". THe bullet went "stem to stern" & stoped the griz. I also own a 300WSM that shoots 180gr loads at about 3000fps. I was very comfortable with my 338, but would not want anything lighter for that close. By the way, forget about recoil. You just don't feel it when you are pumped will adeneline. Shooting at the bench is a different story.