Facing a bear isn’t something you want to mess around with. When it comes to bear defense, not every caliber is up to the task—even if it sounds good on paper. Some just don’t have the stopping power you need when a big animal is charging. Let’s take a look at a few calibers you’ll want to leave behind—and what you should actually carry instead.
.22 LR
A .22 LR might be great for small game or target shooting, but it’s practically useless against a bear. It doesn’t penetrate deeply enough to stop something that weighs several hundred pounds and is full of adrenaline. You might make the bear mad, but you’re not going to stop it.
Instead, you need something that can break bones and reach vital organs. Big-bore handguns like a .44 Magnum or .454 Casull are far better choices. They’re proven in real-world bear defense and can deliver the force needed to actually end the threat.
9mm Luger
A 9mm is a great round for self-defense against people, but against a grizzly? Not so much. Even with hot +P loads, the 9mm often lacks the penetration and energy needed to get through a thick skull or massive shoulder muscles.
If you’re serious about bear country, step up to something like a 10mm Auto. Loaded with heavy, hard-cast bullets, 10mm gives you much better penetration and stopping power while still being manageable to shoot.
.380 ACP
The .380 ACP is often called a “pocket pistol” round for a reason. It’s easy to carry and fine for close-range human threats, but it’s way underpowered for bear defense. Most .380 loads struggle to get decent penetration even through clothing, much less thick fur, muscle, and bone.
If you want a semi-auto option for bears, again, 10mm Auto is your best bet. It’s available in rugged pistols that can handle the heavy loads you’ll need to make a difference if things get ugly.
.223 Remington
The .223 Remington is excellent for coyotes and varmints, but not so much for something that can weigh 800 pounds and come at you at 30 miles an hour. Light bullets and high velocity don’t mean much if they don’t reach deep vital areas on a bear.
For bear defense with a rifle, look toward bigger calibers like .45-70 Government or even .30-06 Springfield with heavy bullets. You need deep penetration, large wound channels, and raw stopping power.
5.7x28mm
The 5.7x28mm is known for speed and armor-piercing abilities in certain military loads, but when it comes to heavy, dangerous game, it’s a poor choice. Small, fast bullets tend to fragment or stop short before reaching anything critical in a thick-skinned animal.
Swap that out for a serious handgun round like .44 Magnum or .500 S&W. These heavy-hitting calibers have a track record of putting down bears quickly when the shot counts.
.17 HMR
The .17 HMR is a fun round for popping squirrels and prairie dogs, but in bear country, it’s about as useful as throwing rocks. It’s way too light and doesn’t have the speed or mass to even make a bear blink.
If you’re carrying a rifle for bear defense, think lever guns in .45-70 or big-bore bolt actions. They’ll kick harder, sure, but they’ll also save your life if a bear decides you look like lunch.
.32 ACP
The .32 ACP was designed a long time ago for pocket pistols and personal defense when deep concealment was the goal. It’s not even close to enough for something as big and dangerous as a bear. You’re better off with harsh words at that point.
Carrying a magnum revolver in .454 Casull, .480 Ruger, or .44 Magnum will give you the power you need. These rounds hit hard, penetrate deep, and are trusted by folks who live and work in bear country every day.
.30 Carbine
The .30 Carbine gained fame in World War II, but against bears, it’s pretty underwhelming. It doesn’t have the heavy bullet weight or energy needed to reliably break down a charging bear. Plus, most .30 Carbine ammo isn’t designed for deep penetration.
If you like semi-autos and want something for bear defense, consider a .308 Winchester loaded with heavy bullets. It’s proven against big animals and gives you the punch you’ll need in a rifle you can actually manage.
.40 S&W
The .40 S&W strikes a balance between 9mm and .45 ACP for personal defense, but when it comes to bears, it’s simply not enough. The bullet weights and velocities aren’t ideal for punching through heavy bone and muscle.
Once again, 10mm Auto is the better choice here. It offers the velocity, bullet weight, and sectional density you need to stop a bear fast. There’s a reason it’s become the go-to choice for many people living in bear country.
.45 ACP
The .45 ACP is famous for its stopping power on two-legged threats, but on a charging bear, it can fall short. Slow-moving, heavy bullets often don’t penetrate deeply enough when you need it most. You might wound the bear, but you probably won’t stop it.
Instead, look toward magnum revolvers. A .44 Magnum or larger can deliver the bone-crushing power you need to get the job done when a bear is bearing down on you at full speed.
*This article was developed with AI-powered tools and has been carefully reviewed by our editors.
