10mm ammo

10mm ammo is the most powerful mainstream semi-auto handgun cartridge — a flat-shooting, hard-hitting round that bridges the gap between service pistols and magnum revolvers. Loaded to full power, the 10mm Auto drives a 180-grain bullet past 1,300 fps for genuine handgun-hunting and bear-defense energy, all from a high-capacity semi-auto like the Glock 20. After a quiet couple of decades it has roared back, favored by hunters, hikers, and anyone who wants maximum power in an autoloader. This page covers full-power versus reduced loads and how the 10mm compares to .45 and 9mm.

Tatted Tacticals stocks 10mm from Federal, Hornady, Underwood, Buffalo Bore, and Sig Sauer — full-power hunting and bear loads plus practice ammo, in boxes and bulk. Browse brand lineups including Underwood and Federal.

Full-Power vs. Reduced 10mm

Not all 10mm is created equal. Full-power loads from Underwood and Buffalo Bore push a 180-grain bullet 1,300+ fps for roughly 700 ft-lbs — true woods and hunting power. Many mainstream loads are downloaded closer to .40 S&W levels for easier shooting and to protect older pistols. If you want the 10mm’s full potential for hunting or bear defense, buy loads specifically labeled full-power; for range and defense, the milder loads are easier to control. Our 10mm ballistic data shows the spread.

10mm vs. .45 ACP and 9mm

The 10mm tops the common auto calibers in energy.

Full-power 10mm carries far more energy than .45 ACP or 9mm, with a flatter trajectory — at the cost of sharper recoil and a larger pistol. It’s essentially a semi-auto answer to the .357 Magnum. Shooters wanting a middle ground look at .40 S&W, a shortened 10mm. Standards follow SAAMI specifications.

Buying 10mm

Federal law sets the minimum age for handgun ammunition at 21, and some states and cities restrict online sales; per ATF guidance, confirm federal rules, then review our ammunition shipping rules and state restrictions before ordering.

10mm Ammo — Frequently Asked Questions

Is a 10mm more powerful than a .45?

Yes, in energy. Full-power 10mm generates significantly more muzzle energy than standard .45 ACP, with higher velocity and a flatter trajectory. The .45 throws a heavier, slower bullet with a larger frontal area. For hunting, bear defense, and downrange energy the 10mm leads; for a big subsonic bullet and mild recoil the .45 has its appeal.

Will a 10mm stop a grizzly bear?

The 10mm is one of the most popular semi-auto choices for bear defense, valued for high capacity and real energy in full-power hard-cast loads. It’s considered adequate with deep-penetrating bullets and good placement, though many in grizzly country still prefer a large-bore revolver. As a carryable, high-capacity bear gun, the 10mm is a respected option.

What are the downsides of a 10mm?

The main trade-offs are sharper recoil than 9mm or .40, larger and heavier pistols, higher ammo cost, and the fact that many factory loads are downloaded below the cartridge’s full potential. For shooters who want maximum auto-pistol power and will buy full-power ammo, those trade-offs are worth it; for everyday carry, a milder caliber is easier.

Is 10mm ammo hard to find?

It’s less common than 9mm or .45 but has become widely available again with the cartridge’s resurgence. Every major manufacturer now produces it, and specialty makers offer full-power hunting loads. During shortages it can thin out faster than high-volume rounds, so buying your preferred load when available is wise.

Can you buy 10mm ammo online?

Yes. In most U.S. states you can buy 10mm online and have it shipped to your door. You must be at least 21 for handgun ammunition, and some states and municipalities add restrictions or shipping limits, so confirm your state and local laws before ordering.