I own a 338 Win Mag, and have used it extensively. It works just fine. Big Bears, Elk, Deer and Coyotes. But the 30-06 does to. The 308 is a great cartridge. But the 30-06 loaded to its potential is far and away a better round. The bullets today have changed how we view what’s enough. I think the 30-06 is perfect. I wouldn’t hesitate to use a 30-06 on a tundra Grizzly Bear. The right bullet = a dead bear. Just my opinion, and I’ve hunted them 4 times and killed 3 of them.