10mm is a specialist's carry cartridge. If your carry environment includes large animals, long distances from help, or a truck and a trail rather than a sidewalk, a full-size 10mm like the FN 510 Tactical or Sig P320-XTEN earns its size. For ordinary concealed carry, a 9mm you shoot faster is still the better tool.
Why 10mm Went Away and Came Back
The FBI adopted 10mm Auto in 1989 after the 1986 Miami shootout, then found the full-power load was more recoil than many agents could manage, which led directly to the shorter .40 S&W in 1990. Commercial 10mm spent two decades as a niche. It came back because of the hunting and backcountry market: a 10mm pistol delivers roughly .357 Magnum-class energy from a magazine-fed semi-auto with 15 or more rounds, and manufacturers who never made one before now do.
That history matters for one reason: not all 10mm ammunition is full power. Plenty of commercial 10mm is loaded to roughly .40 S&W velocities for softer recoil. If the point of carrying 10mm is the energy, read the manufacturer's published velocity for the load you buy, not the caliber on the box.
Who Actually Benefits
- Hikers, hunters, and rural carriers who may face a large animal and want a pistol that's also a credible defensive handgun against people.
- Shooters who already carry a full-size pistol and want more cartridge in the same footprint.
- Anyone in bear country who wants to carry one gun rather than a defensive 9mm plus a big revolver. WheelGuns.co covers the revolver side; this is the semi-auto case.
Who doesn't: the urban concealed carrier. Recoil is slower to recover from than 9mm, the pistols are full-size, ammunition costs more and is harder to find, and holster selection is a fraction of what a Glock 19 enjoys. The 9mm defensive ammo guide explains why 9mm is enough for that job.
The Two Pistols
| Spec | FN 510 Tactical | Sig P320-XTEN |
|---|---|---|
| Caliber | 10mm Auto | 10mm Auto |
| Capacity | 15+1 and 22+1 mags, per listing | 15+1 |
| Barrel | Threaded, per listing | 5 in, per listing |
| Optic | Optics-ready (FN plate system) | Optics-ready |
| Frame | Polymer, full size | Polymer X-Series grip, full size |
| Origin | FN America | Sig Sauer |
FN 510 Tactical 10mm
Capacity10mm · threaded barrel · 15+1 / 22+1 per listing
FN's 510 scales the 509 platform to 10mm and ships with both a standard and an extended magazine, per the listing. The threaded barrel and optic cut make it the most configurable 10mm in this class, and 22 rounds of 10mm in one magazine is a genuine backcountry argument. It's big; treat it as an open-carry or chest-rig pistol on the trail.
Sig Sauer P320-XTEN 10mm
Shootability10mm · 5 in barrel · 15+1
Sig's XTEN puts 10mm in the P320 X-Series frame with a five-inch barrel, which adds velocity and sight radius and helps tame the recoil impulse. It's optics-ready and shares the P320's modular fire-control-unit design. If you already shoot a P320 well, the XTEN is the obvious step up in cartridge.
Ammunition: Buy Full Power on Purpose
Federal's 200-grain HST in 10mm is a full-weight defensive hollow point built for the cartridge, and it's the kind of load that makes sense against people. For large animals, most guides recommend a heavy hard-cast or bonded solid rather than a hollow point, and that's where the 10mm ammunition aisle gets specialized. Whatever you choose, chronograph numbers from the manufacturer are the truth; "10mm" on the box is not.
Recoil, Holsters, and Training
Full-power 10mm from a polymer pistol is manageable, not punishing, but it is slower to recover from than 9mm and it will show you every flaw in your grip. Plan on more practice, not less. For carry, a light-bearing holster is worth considering on a trail gun, since the same pistol may be on the nightstand at camp; the holster positions guide covers strong-side and chest-rig options that suit a full-size pistol under a pack strap.
The Honest Comparison With 9mm
Against a person, modern 9mm hollow points perform well enough that the FBI moved back to 9mm in 2015, citing faster follow-up shots and capacity. 10mm doesn't change that math for ordinary carry. What it changes is the worst case in the woods, where energy and penetration matter more than split times. If that worst case is in your life, 10mm is a rational choice. If it isn't, the full-size handguns guide covers the 9mm pistols that do the everyday job better.
Key Takeaways
- 10mm makes sense for backcountry, rural, and bear-country carry, not for everyday concealed carry.
- FN 510 Tactical: threaded, optics-ready, 15 and 22-round magazines per listing. Sig P320-XTEN: 5-inch barrel, X-Series grip, 15+1.
- Much commercial 10mm is downloaded; buy full-power ammunition by its published velocity.
- Expect more recoil, fewer holsters, and more training. Verify with 200 rounds before carrying.
Frequently Asked Questions
Is 10mm a good concealed carry cartridge?
For most people, no. It works, but 9mm gives faster follow-up shots, more capacity per ounce, and far more holster and ammunition choice. 10mm makes sense when large animals or long distances from help are part of the picture.
Why did the FBI drop 10mm?
The full-power load produced more recoil than many agents could manage effectively. The shortened .40 S&W followed in 1990, and the FBI returned to 9mm in 2015.
Is all 10mm ammunition full power?
No. Many commercial loads are loaded closer to .40 S&W velocity. Check the manufacturer's published velocity for the specific load.
FN 510 Tactical or Sig P320-XTEN?
The 510 offers a threaded barrel and a 22-round magazine per listing; the XTEN offers a 5-inch barrel and the P320 platform. Choose the one whose grip fits your hand, since both are optics-ready full-size pistols.