It must be stressed, though, that the 7mm-08 Rem. is unsuitable for use on the three big bears (polar, brown, and grizzly) and on other dangerous game. In a self-defensive situation requiring stopping power on dangerous game at close range, use of a larger and heavier caliber is strongly advised. Stephen Herrero, a bear behavior expert, cites a study by the U. S. Forest Service in Alaska that concluded the .458 Winchester Magnum with a 510-grain load, .375 H&H Magnum with a 300-grain load, .338 Winchester Magnum with a 300-grain load, and .30-06 Springfield with a 220-grain load were "superior for protection against bears".