I am digging my .308 bolt action rifle. This is the first one i have owned. I have done some research and some of my friends have give me their positive opinions on this caliber. Here is my question.....If I were to take a trip to Alaska or say Canada to hunt Grizzly Bear, will the .308 be sufficient to take it down in one good shot? I know it is a powerful cartridge as it has done nasty damage on a couple of deer. I also know that from reading some of the websites for "Grizzly Guided Hunts", theyrecommend .300 WINMAG and 7mm MAG. Any expert advice on this would be appreciated. Thanks.