Jun 09, 2022 · For bear defense, getting multiple shots on target quickly can mean the difference between life and death. That’s in part why MeatEater’s Clay Newcomb chose the 9mm over the .45 and the .44 Magnum. Controlling a handgun’s kick can be difficult, and two hits with a smaller caliber is almost always better than one hit with a larger one.. The GP100 is a .357 Magnum, which means it’s ideal for defense against black bears as opposed to much larger brown or grizzly bears. However, the Ruger GP100 is a fantastic firearm with a smaller caliber that allows people to shoot faster and more accurately than a .44. In the right situation, the GP100 is a great option for bear defense. "/>Best caliber for bear defense