Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
The Underwood 40 S&W 180-grain Full Metal Jacket is a flat-nose defense load built for barrier penetration and woods carry. Underwood 40 S&W 180gr FMJ launches a non-expanding projectile at 1100 feet per second, delivering 484 foot-pounds of energy at the muzzle. The flat-nose profile maintains nose-forward orientation through heavy clothing, intermediate barriers, and dense tissue — where round-nose bullets can tumble. Nickel plated cases resist corrosion in humid holsters and leather mag pouches, feed reliably in all semi-automatic actions, and clean up faster during resizing. Flash-suppressed powder protects your night vision if you engage a threat after dark. Each round is loaded in boxer-primed, reloadable brass and assembled in the United States.
Built for the Box
Underwood loads this 180-grain FMJ to full-power specifications, using new nickel plated brass treated with the Ducta-Bright 7a process. That electroplating method eliminates the embrittlement seen in older nickel formulations — cases retain the same reload life as raw brass, withstand high chamber pressures in +P pistol platforms, and resist stress cracks at the case mouth during deep draws. The boxer primer ignites flash-suppressed powder that burns clean and fast, reducing muzzle signature in low light. The 180-grain flat-nose bullet seats to an overall length that cycles in Glock 22/23, Springfield XD, Sig P229, and Smith & Wesson M&P pistols. Underwood field-tests each lot in customer-representative firearms before shipping.
The Numbers
| Spec | Value |
|---|---|
| Caliber | 40 S&W |
| Bullet weight | 180 grains |
| Bullet type | Full Metal Jacket (flat nose) |
| Muzzle velocity | 1100 fps |
| Muzzle energy | 484 ft-lbs |
| Rounds per box | 50 |
| Case | Nickel plated brass (Ducta-Bright 7a) |
| Primer | Boxer |
| Corrosive | No |
| Reloadable | Yes |
| Lead free | No |
| Best use | Self defense / woods carry |
| Manufacturer | Underwood Ammunition |
The flat-nose bullet design shines in outdoor carry scenarios where you may confront large predators or aggressive game — the non-expanding profile drives deep, and the flat meplat crushes a wider wound channel than round-nose FMJ. Browse more duty and defense options in our 40 cal ammo catalog.
Safe Handling & Compliance
Federal law requires purchasers to be at least 21 years old 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 universal rules of firearms safety at all times.
- Verify your state and local laws permit possession of 40 S&W ammunition before purchase.
- This ammunition contains lead — handle in a ventilated area and wash hands after use. California residents: see Prop 65 warnings.
Reviews
There are no reviews yet.