As per Phill Shoemaker the biggest costal brown bear(or maybe it was a grizzly I can’t recall) was killed using a 30-06…. I also always heard that big bear are not really hard to kill, dangerous perhaps but not the same dangerous as Cape buffalo dangerous, they don’t soak up lead like the “Black Death” can. I don’t say go after them with the smallest lightest cartridge you have but you don’t need a special DG game rifle to hunt them… that said if you need to stop one that is charging you and is closing in at 10-15 yards well good luck with that, unless you have your rifle at the ready, loaded, safety off and shouldered, that you have practiced on moving targets and that you can for sure place a bullet at the right place at the right time…. You have not a chance! My friends who died a few years back on there trap line, when the husband/father came on the scene he had his rifle ready loaded and when that bear came to him, he was ready and put that bear down. But if the bear would have come from behind he would most likely be with his wife and daughter….
People have to get real lol bear charges are one thing and bear attack are another!!
In nearly 30 years living in bear country seeing bears on my morning walk in the neighbourhood, I never had one charge me. That said I have more than one person I knew that got killed and every time no matter the size of the gun they ended up not being able to tell the story!
That is just my experience though so don’t take that for cash!!