The . 30/30 is not just a proven bear killer, it is probably the most-proven bear killer. Select a quick-expanding bullet for this kind of hunting.

What caliber do you need to kill a bear?

44 Magnum is the minimum for charging bears, many others have opted for a Glock 20 in 10mm Auto and, interestingly enough, passed right by the . 357 S&W Magnum. Several folks have even successfully killed bears with a 9mm. While a well-placed shot from a 10mm can no doubt do the trick, the .

What caliber will kill a grizzly bear?

Look for the biggest caliber you can shoot well in a rifle with a controlled-feed action like the Winchester Model 70 Safari Express, or the Ruger Guide Gun. While big bore rifles are ideal, even a . 308 will work.