Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
Underwood 10mm 200gr FMJ ammunition loads a flat-nose full metal jacket projectile over flash-suppressed powder in nickel-plated brass, producing 1250 feet per second and 694 foot-pounds of energy from a 5-inch test barrel. The 10mm Auto cartridge sits between .40 S&W and .357 Magnum in terms of pressure and energy, and the 200-grain bullet weight pushes the upper end of the 10mm’s case capacity while maintaining controllable recoil in full-size autoloaders. Underwood designs this load for woods carry and large-game scenarios where you need a non-expanding projectile to punch through heavy bone and muscle without deflection.
Built for the Box
Each round uses boxer-primed, reloadable nickel-plated brass treated with Underwood’s Ducta-Bright 7a process — a proprietary nickel application that resists case embrittlement during repeated reloading cycles and prevents cracking under high-pressure loads. The nickel finish sheds moisture, resists tarnish in leather holsters or humid storage, and cycles smoothly through match chambers and feed ramps. The flat-nose profile on the FMJ bullet keeps the projectile nose-forward during penetration, maximizing straight-line depth through dense tissue and preventing tumble that would reduce terminal effect on large animals. Flash-suppressed powder preserves low-light vision if you fire after dusk or before dawn.
Performance at a Glance
| Spec | Value |
|---|---|
| Caliber | 10mm Auto |
| Bullet weight | 200 grains |
| Bullet type | Full Metal Jacket (flat-nose) |
| Muzzle velocity | 1250 feet per second |
| Muzzle energy | 694 foot-pounds |
| Rounds/box | 50 |
| Case | Nickel-plated brass |
| Primer | Boxer |
| Corrosive | No |
| Reloadable | Yes |
| Test barrel length | 5 inches |
| Intended use | Self defense, woods carry, large game |
| Country of origin | United States |
Underwood field-tests all loads using customer-common firearms under real-world conditions and backs each box with a 100% performance guarantee. This load fits Glock 20/40, 1911 10mm platforms, and other factory 10mm pistols with standard chambers. You’ll find more 10mm options in our Underwood 10mm Ammo category.
Safe Handling & Compliance
Federal law requires purchasers to be at least 18 years old for rifle and shotgun ammunition, and at least 21 for handgun ammunition. Ammunition cannot be shipped to certain states, counties, and cities — review our ammunition shipping restrictions before ordering. Store ammunition in a cool, dry location away from heat sources and out of reach of unauthorized users.
- Follow the four rules of firearms safety at all times — treat every firearm as loaded, never point at anything you’re not willing to destroy, keep your finger off the trigger until ready to fire, and know your target and what lies beyond it.
- Check your local and state regulations before purchasing handgun ammunition — some jurisdictions require permits, background checks, or impose quantity limits.
- This ammunition contains lead components — California Proposition 65 requires disclosure that lead exposure may cause cancer and reproductive harm. Wash hands after handling and avoid indoor firing without adequate ventilation.
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