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Handgun Ammo

10mm Auto Ammo

In stock from $0.54 / round · 7 of 14 products available now

Two cartridges share this name: mild factory loads that run at .40 S&W speeds, and full-power ones that emphatically do not. Read the velocity, not the headstamp.

In stock today

Cost per round
$0.54 to $2.32
6 Brands
DoubleTap, Fiocchi, G9 Defense, PMC, Underwood, Winchester
Bullet weights
115, 145, 180, 200, 230 grain
Pack sizes
20, 50, 200, 500, 1,000 rounds
Learn more about 10mm Auto

At a glance

Also known as
10mm Auto, 10x25mm
Common bullet weights
155, 180 and 200 grain
Typical use
Woods defense, handgun hunting, hiking in bear country
Before you buy
Factory loads run from .40-level to genuinely full power. Read the velocity, not the name
Age to purchase
21+ (the federal licensed-dealer minimum for ammunition suitable for a handgun, applied as TAS policy)

10mm Auto is the full-power semi-automatic pistol cartridge: a longer case than .40 S&W at higher pressure, throwing the same diameter bullet a good deal faster. It was briefly an FBI service cartridge before being downloaded into what became the .40, and it has since found a settled home as a hiking, hunting and woods-defense round in guns that carry more rounds and reload faster than a magnum revolver. The single most important thing to understand about buying it is that the box says 10mm and that tells you almost nothing about what is inside.

What to know before buyingCommon questions

Before you buy

What to know about 10mm Auto

What people buy it for

  • Woods and trail carry in bear or hog country
  • Handgun hunting for deer and hogs at moderate range
  • Backcountry and backpacking sidearms
  • Shooters who want magnum-class energy with a semi-auto's capacity

"10mm" covers an enormous range of power

Some major-brand 10mm practice ammunition is loaded barely above .40 S&W, deliberately, so it is pleasant to shoot in any pistol on the market. Specialty makers load it to the ceiling of what the cartridge was designed for. Both are correctly labelled 10mm Auto. If you are buying for the woods you must read the published velocity and bullet weight rather than the caliber on the end flap, and if you are buying to practice, downloaded ammunition is a feature, not a fault.

Hardcast for penetration, hollow points for people

Against a large, heavy animal the job is penetration through bone and muscle, and that is what a heavy flat-nosed hardcast bullet is designed to do. A hollow point that performs beautifully against a two-legged threat will often open early and stop short on something much bigger. Match the bullet to the animal, not to the reputation of the cartridge.

Full-power loads work the pistol hard

A steady diet of genuine full-power ammunition batters a recoil spring and a frame faster than range loads do. Many owners run a heavier recoil spring, and sometimes a buffer, when shooting hot ammunition regularly. It is cheap insurance and it also softens the slide slam that makes some full-power 10mm unpleasant.

It is not a long .40

10mm Auto and .40 S&W share a bullet diameter and nothing else you can rely on. The 10mm case is longer and the pressure is higher. Neither cartridge is safe in the other's chamber, though some pistols convert between them with a barrel and magazine change.

Questions

Common questions

Is all 10mm ammunition full power?

No, and this is the thing that catches people out. Mainstream practice and even some defensive 10mm is loaded conservatively (close to .40 S&W performance), so it shoots comfortably in every pistol chambered for it. Specialty ammunition is loaded to what the cartridge can actually do. Both wear the same name. Read the published bullet weight and velocity on the box before you rely on it.

Can I shoot .40 S&W in my 10mm pistol?

No. The .40 case is shorter and would have nothing to headspace against in a 10mm chamber. Some pistols can be converted with a dedicated .40 barrel and magazines, which is a different thing entirely. Never mix the two in a magazine or a range bag.

What should I carry in 10mm for bear country?

The conventional and well-reasoned answer is a heavy hardcast flat-nose bullet from a maker that publishes real velocity from a barrel like yours. Deep, straight penetration is what matters against a large animal, and it is precisely what an expanding bullet trades away. Also confirm the load cycles your pistol reliably: a woods gun that stovepipes is worse than no gun.

Do I need a heavier recoil spring?

If you shoot genuine full-power ammunition in any quantity, most owners find a heavier-than-stock recoil spring worthwhile; it slows the slide, reduces the beating the frame takes and often improves how the pistol feels. Consult your pistol's manufacturer or a reputable spring maker for the right rate rather than guessing.

How much does 10mm Auto cost per round?

10mm Auto runs from $0.54 to $2.32 per round in stock right now. Every price on the page carries its cost per round beside it, so the comparison is one glance rather than arithmetic.

Is it cheaper to buy 10mm Auto by the case?

Usually, yes. We stock 10mm Auto from 20 rounds up to 1,000, and the cost per round beside each price is what shows whether a particular case actually beats the box. It is not automatic: a discounted box sometimes wins.

Which brands of 10mm Auto do you stock?

DoubleTap, Fiocchi, G9 Defense, PMC, Underwood and Winchester are in stock in 10mm Auto today. Stock changes as the feed runs, so the list on the page is the current one.

What bullet weights does 10mm Auto come in?

The 10mm Auto in stock runs 115, 145, 180, 200, 230 grain. Weight changes how the round feels and where it prints more than most shooters expect, so it is worth matching what you already shoot.

Is 10mm Auto in stock?

7 of the 14 10mm Auto products we list are in stock right now. Out of stock items stay on the page rather than disappearing, so a link you saved still works and you can see what normally sits here.

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