Last reviewed: 2026-04-18 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.
Underwood 45 Colt +P 325 grain flat nose ammo is engineered for woods defense and hunting applications where deep, straight-line penetration matters more than expansion. Chambered in 45 Colt (Long Colt) +P, this hard cast load exits the muzzle at 1325 feet per second and delivers 1267 foot-pounds of energy — power sufficient to stop charging hogs or black bear when placed correctly. The flat nose profile maintains a nose-forward trajectory through dense muscle and bone, creating a permanent wound channel that round nose bullets cannot match. Hunters and guides working heavy brush or close quarters rely on non-expanding projectiles like this 325-grain bullet because they penetrate deeply without fragmenting or tumbling. The Black Cherry polymer coating is Underwood’s answer to leading: a thermally stable compound that eliminates lead-to-bore contact, withstands high pressure and heat, and self-lubricates under friction. You can push velocities without fouling the forcing cone or barrel.
Load Profile
This +P load generates chamber pressure above SAAMI specifications for standard 45 Colt — verify your revolver is rated for +P before firing. Underwood uses flash-suppressed powder to preserve night vision during low-light encounters. Nickel-plated brass cases resist corrosion and tarnish, feed reliably, and reload cleanly. Boxer primers are non-corrosive. Each case is reloadable. The bullet is not lead-free; California Proposition 65 applies. This ammunition is supersonic and suppressor-safe. Sectional density is 0.227, which correlates to moderate penetration depth in tissue. Ballistic coefficient data was not provided by the manufacturer.
| Spec | Value |
|---|---|
| Caliber | 45 Colt (Long Colt) +P |
| Bullet weight | 325 grains |
| Bullet type | Hard cast flat nose (Black Cherry coated) |
| Muzzle velocity | 1325 fps |
| Muzzle energy | 1267 ft-lbs |
| Rounds/box | 20 |
| Case | Nickel-plated brass |
| Primer | Boxer, non-corrosive |
| Reloadable | Yes |
| Intended use | Hunting, woods defense |
| Manufacturer | Underwood Ammo (USA) |
This load is purpose-built for hunters and guides who encounter dangerous game at close range. If you carry a 45 Colt revolver in hog country or black bear habitat, this 325-grain hard cast flat nose delivers the penetration you need. For more 45 Colt options, see our 45 long colt ammo selection.
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 rules of firearm safety at all times.
- Verify your revolver is rated for +P pressure before firing this ammunition. Consult your owner’s manual or contact the manufacturer if unsure.
- This ammunition contains lead. Per California Proposition 65, lead exposure can cause cancer and reproductive harm. Wash hands after handling.
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