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Questions & Answers
Customer Reviews
Helpful Positive Review 10mm Underwood Ammo by Big Sky, Verified Owner, September 19, 2023
This is definitely high performing. Its gives you a lot more comfort when traveling through Mountains that you have this at your side. This is my new carry ammo for the woods for my hunting backup gun. The ammo is powerful and accurate aswell as work...
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2/2 found this helpful
Most Recent Reviews Underwood 10mm 155 Is Decent by Naturalist, Verified Owner, September 22, 2025
I used the Underwood 10mm Auto 155gr Xtp Jhp , in both an EAA Tangfolia Witness Standard and Compact pistols and had no issues with functioning. At 20 yards they were very accurate and the grouping for 5 shots was about 1 1/2" inches. I would defini...
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Most Recent Reviews Underwood 10mm 155 gr by Bunnybuster, Verified Owner, July 10, 2025
Great ammo fast and hits hard no jams or fail to feed..optics planet had it cheaper and with the free shipping i got it for less than if i ordered it right from underwood...ive been shooting this stuff a long time very accurate and dependable ammunit...
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Most Recent Reviews Awesome Ammo by steve, Verified Owner, January 23, 2025
This the best 100mm for concealed carry you might want 200gr for Bear but this is best for city folk
0/1 found this helpful
Most Recent Reviews Real 10mm power by Baxter, Verified Owner, November 23, 2024
1550 fps from a 6” barrel not too much recoil. What 10mm is supposed to be.
Most Recent Reviews hard hitting by Bruce Cook, Verified Owner, November 3, 2024
This stuff is what 10mm was meant to be loaded like. Full power flawless rounds. Buy with confidence!
Read All 6 Reviews
Number of Rounds: 20

Code: 40U-LAP-A232-232

MPN: 232

UPC: 816874020286

List: $46.79Save 42%
$1.36/Round
$27.19

Please note: For safety reasons, OpticsPlanet is not able to accept returns of ammunition for any reason, and no refunds will be issued for any returned ammunition.

Product Info for Underwood Ammo 10mm Auto 155 Grain Jacketed Hollow Point Nickel Plated Brass Cased Pistol Ammunition

Underwood Ammo XTP rounds are notable for their power and accuracy. In Underwood Ammo, they utilize Hornady eXtreme Terminal Performance (XTP) bullets which are designed for deep terminal penetration, great accuracy and controlled expansion. They combine Hornady unparalleled XTP bullets with their own carefully formulated design which results in one lethal round.image

Nickel-plated brass casings, the nickel plating process provides several key benefits, not limited to but including; improved feeding in all actions of firearms enhanced corrosion resistance over traditional brass, improved cosmetics, and ease of cleanup during reloading. Nickel-plated casings will not tarnish like brass during storage or when in contact with foreign materials such as leather, moisture, and other metals. As with all of Underwood Ammo rounds, they utilize flash suppressed powder so that your vision will not be compromised if it becomes necessary to use your firearm in low light. While taking advantage of their state of the art testing equipment, this high-performance ammunition is field tested using popular, real firearms that Underwood Ammo's customers are most likely to own out in the real world with all the elements you would experience. This ammunition is new production, non-corrosive, in boxer primed, reloadable brass cases.

WARNING: California`s Proposition 65

Specifications for Underwood Ammo 10mm Auto 155 Grain Jacketed Hollow Point Nickel Plated Brass Cased Pistol Ammunition:

Manufacturer: Underwood Ammo
Caliber: 10mm Auto
Number of Rounds: 20
Bullet Type: Jacketed Hollow Point (JHP)
Bullet Weight: 155 grain
Cartridge Case Material: Nickel Plated Brass
Muzzle Velocity: 1500 ft/s
Muzzle Energy: 775 ft-lbs
Application: Hunting
Package Type: Box
Primer Style: Centerfire
Lead Free: No

Features of Underwood Ammo 10mm Auto 155 Grain Jacketed Hollow Point Nickel Plated Brass Cased Pistol Ammunition

  • This ammo is a proven round for hunting.
  • The bullet in this product does contain lead.
  • This round is designed to be supersonic and travels faster than the speed of sound.
  • This product has been designed to be an effective choice for the ultimate in self-defense applications.
  • The bullet in this product has a Sectional Density, (SD) of 0.138392857142857. SD is the ratio of an object's mass to its cross sectional area with respect to a given axis. It conveys how well an object's mass is distributed (by its shape) to overcome resistance along that axis.
  • This ammo IS SAFE to use in a suppressor.
  • The bullet in this ammo has a ballistic coefficient (G1) of 0.137 - Generally, the higher the coefficient, the more stable the projectile will be in flight.

Package Contents:

  • Underwood Ammo 10mm Auto 155 Grain Jacketed Hollow Point Nickel Plated Brass Cased Pistol Ammunition

Underwood Ammo 10mm Auto 155 Grain Jacketed Hollow Point Nickel Plated Brass Cased Pistol Ammunition Orderable Models

List of Orderable Models

Underwood Ammo 10mm Auto 155 Grain Jacketed Hollow Point Nickel Plated Brass Cased Pistol Ammo, 20 Rounds, 232 , MPN: 232 , UPC: 816874020286 , Code: 40U-LAP-A232-232
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