Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
For 40 S&W shooters running suppressed pistols or seeking maximum penetration in a defense load, the Underwood 40 S&W 200 grain flat nose delivers subsonic velocity without sacrificing terminal effectiveness. At 1000 feet per second, this hard cast flat nose round generates 444 foot-pounds of muzzle energy while remaining hearing-safe when paired with a suppressor. The flat nose profile maintains nose-forward orientation through barriers, and the proprietary Black Cherry polymer coating prevents lead fouling at the gas port — critical for suppressed guns running high round counts. Underwood loads this cartridge in nickel-plated brass with non-corrosive boxer primers, suitable for reloading and resistant to tarnish in carry holsters.
Built for the Box
Underwood manufactures this load in the United States using a hard cast lead projectile coated with their Black Cherry polymer compound. The coating withstands high pressure and heat without the plastic-burning odor common to older Hi-Tek finishes, and it reduces friction against the bore while sealing gases at the bullet base. The flat nose design delivers straight-line penetration through heavy clothing, drywall, and intermediate barriers — ideal for home defense or woods carry where deep wound channels matter more than rapid expansion. Nickel-plated brass casings feed reliably in Glock, SIG, and M&P pistols, and the flash-suppressed powder formulation preserves night vision if you fire in low light. Each case is boxer primed and reloadable, with headstamps suitable for load development.
The Numbers
| Spec | Value |
|---|---|
| Caliber | 40 S&W |
| Bullet weight | 200 grains |
| Bullet type | Flat Nose (hard cast, Black Cherry coated) |
| Muzzle velocity | 1000 fps |
| Muzzle energy | 444 ft-lbs |
| Rounds/box | 20 |
| Case | Nickel Plated Brass |
| Primer | Boxer, non-corrosive |
| Reloadable | Yes |
| Suppressor safe | Yes (subsonic) |
| Intended use | Self Defense |
| Manufacturer | Underwood Ammo (USA) |
This load sits in the subsonic band for 40 S&W, making it a natural fit for threaded barrels and pistol suppressors. You can browse the full 40 cal ammo catalog for standard-pressure and +P options if you prefer supersonic velocities.
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.
- Observe the four universal firearms safety rules at all times — treat every firearm as loaded, keep your finger off the trigger until ready to fire, never point the muzzle at anything you are not willing to destroy, and be certain of your target and what lies beyond it.
- Verify that your pistol is rated for standard-pressure 40 S&W and that the bore is clear before loading.
- This ammunition contains lead; wash hands after handling and follow California Proposition 65 guidelines if storing or transporting in that state.
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