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Best caliber for bear defense
Every option is a trade between power and how easily you'll carry it. Here is how the common choices compare, strongest first.
| Option | Cartridges | Strength | Trade-off | |
| Big-bore rifle | .45-70, .375 H&H, .338 Win Mag | Most power and reach; the guide's choice | Two hands, carried slung — not always at hand | Shop → |
| 12-gauge with slugs | Full-bore 12 ga slugs | Hits very hard; simple, forgiving pump guns | Long gun; heavy recoil; limited rounds | Shop → |
| Heavy revolver | .454 Casull, .460 S&W, .480 Ruger, .500 S&W | Most power you can wear on a chest holster | Heavy, stout recoil, 5–6 rounds | Shop → |
| .44 Magnum revolver | .44 Magnum (and .41 Magnum) | The classic; proven, widely available ammo | Recoil; 6 rounds | Shop → |
| 10mm pistol | 10mm Auto | Most rounds, lightest carry, softest recoil | Least power per shot of this list | Shop → |
How to choose
Hunting or guiding with a rifle already in hand? Your rifle is your bear gun — a .375, .338 or .45-70 with heavy bullets.
In camp, on the boat or working a site? A 12-gauge pump with slugs is hard to beat.
Fishing, hiking or with your hands busy? A handgun you wear on a chest holster. Choose .44 Magnum or heavier if you shoot a revolver well; choose 10mm if capacity and lighter recoil matter more.
A few from each group
In stockShips to FFL
In stockShips to FFL
Mossberg
★ 4.9 (143)
$538.19
Gauge: 12 Gauge | Capacity: 5
In stockShips to FFL
Mossberg
★ 4.7 (59)
$567.51
Gauge: 12 Gauge | Capacity: 5
In stockShips to FFL
Taurus
★ 4.7 (104)
$618.11
Capacity: 5 | Barrel Length: 4.0
In stockShips to FFL
Taurus
★ 4.8 (98)
$704.94
Capacity: 6 | Barrel Length: 6.5
In stockShips to FFL
Smith & Wesson
★ 4.8 (41)
$851.56
Capacity: 15 | Barrel Length: 5.6
In stockShips to FFL
Smith & Wesson
★ 4.6 (17)
$1292.01
Capacity: 6 | Barrel Length: 4.0
Common questions
What caliber is best for bear defense?
Power ranks roughly: big-bore rifle, 12-gauge slug, heavy revolver cartridges (.454/.460/.480/.500), .44 Magnum, then 10mm. The best one for you is the most powerful gun you will actually carry every time and can hit with quickly.
What is the minimum handgun caliber for bear?
Most people treat 10mm with heavy hard-cast or solid bullets as the practical floor for brown-bear country, with .44 Magnum and larger preferred. Smaller defensive calibers are not built for the penetration bears require.
What is the best bear defense ammo?
For handguns, heavy hard-cast flat-nose or solid bullets that penetrate deeply; for shotguns, full-bore slugs; for rifles, controlled-expansion or solid bullets made for large game. Test the exact load in your gun before carrying it.
Is a 9mm enough for bear defense?
It is generally considered marginal. Some people carry 9mm with deep-penetrating solid bullets for black bears, but for brown bears most choose 10mm or a magnum revolver.
Is .45-70 good for bear?
Yes — a .45-70 lever rifle with heavy bullets is a traditional brush and river gun in brown-bear country, and it is fast to handle in thick cover.
Before you carry in bear country
- Practice with the loads you'll carry. Full-power bear loads recoil much harder than range ammunition. Shoot them enough to hit quickly under stress.
- Carry it where you can reach it. A chest holster keeps a handgun clear of a pack's hip belt and waders.
- Consider bear spray too. Many people in the field carry both; they solve different problems.
- Know the rules where you'll be. Carry rules differ on federal land, in parks and on private land — see our Alaska gun laws guide.
- If you do have to shoot. In Alaska, a bear killed in defense of life or property must be reported to the Alaska Department of Fish and Game, and the hide and skull salvaged and surrendered. Check the current ADF&G rules.
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