So umm, yeah...I've never hunted for grizzlys and I LOVE the classic 308. Is it enough gun to put cleanly put one down, sure. But your not dealing with an animals size when you bear hunt, you have to take serious consideration that the think will figuratively and literally tear you apart if provoked and given the chance. Seeing that shooting the think is probabley sufficient provacation I'd want alot more gun than the 308 or 30-06!!! The 300s and 338s would seem like a reasonable place to start. Maybe you can find someone with a 416/458 ("whatevers") and judge the recoil yourself.