Underwood 9mm +P+ 115gr Penetrator – Powerful Defense Ammo

Description

The Underwood 9mm +P+ 115gr Penetrator load, Underwood item 823, is a 20 round box of 9mm Luger +P+ ammunition loaded with a 115 grain Xtreme Penetrator bullet rated at 1300 fps with 432 ft-lbs of muzzle energy.

Underwood 9mm +P+ 115gr Penetrator Overview

Underwood Ammo builds high-performance ammunition in Sparta, Illinois, and is known for loading cartridges to their full potential. Many Underwood loads run faster than typical factory ammunition while staying within safe pressure limits, and the company pairs that speed with premium bullets from makers such as Lehigh Defense and Hornady. Cases are nickel plated for smooth feeding and corrosion resistance.

Bullet Design

The Xtreme Penetrator bullet, designed by Lehigh Defense, is a solid copper projectile with a unique fluted nose. It is built for maximum penetration, and Underwood says it creates a larger permanent wound column with over twice the penetration of most expanding bullets. Its blunt nose helps it feed reliably, and its lead-free construction makes it a fit where lead-free ammunition is preferred.

Intended Use

This load is built for personal protection where deep penetration through heavy clothing and barriers matters, and it also works as a woods carry load for protection against animals. Its solid copper construction will not fragment or shed its jacket. Always confirm reliable feeding and point of impact in your own firearm before you rely on it.

Firearm Compatibility

This ammunition is made for firearms chambered in 9mm Luger. Always check the caliber marking on your barrel or slide before loading. This is a +P+ load, loaded above +P pressure. There is no industry pressure standard for +P+, so use it only in modern firearms whose maker approves +P+ ammunition, and limit high-volume shooting with it.

About Underwood Ammo

Underwood Ammo is a family-run American company that has built a reputation for powerful, accurate ammunition. Each load is developed and tested in-house, and the company publishes velocity and energy figures for every product so shooters know exactly what they are getting.

Recoil and Shootability

Underwood loads tend to produce more recoil and muzzle blast than standard practice ammunition. Practice with the load you carry so follow-up shots stay fast and accurate.

Why Shooters Choose Underwood

Shooters choose Underwood because the published numbers are real and the loads deliver them. Pairing premium bullets with carefully developed powder charges gives each load a clear purpose, whether that is defense, hunting or practice. Nickel or brass cases, quality primers and careful loading round out a product that many shooters trust when performance matters most.

Practice and Testing

Fire a few magazines or cylinders of this load before relying on it for defense or hunting. Confirm reliable feeding, extraction and point of impact, since fast or heavy loads can print to a different point than practice ammunition.

Choosing a Load

Choose your bullet for the job: solid copper fluid-transfer bullets for defense through barriers, expanding hollow points for controlled expansion, and hard cast or penetrator designs for large animals. Then pick a weight and speed you can shoot accurately.

Storage and Care

Store ammunition in a cool, dry place in its original boxes, away from solvents and lubricants that can contaminate primers. Inspect rounds before loading, and set aside any with dents, loose bullets or corrosion.

Specifications

• Brand: Underwood Ammo
• Item number: 823
• Caliber: 9mm Luger +P+
• Bullet weight: 115 grain
• Bullet type: Xtreme Penetrator (solid monolithic copper)
• Muzzle velocity: 1300 fps
• Muzzle energy: 432 ft-lbs
• Case: Nickel
• Lead-free: Yes
• Count: 20 rounds per box
• UPC: 816874020217
• Made in the USA
• Photo note: one gallery photo shows a related Underwood load, included to show the packaging style.

Before You Buy

Federal law requires buyers of handgun ammunition to be at least 21 years old when buying from a licensed dealer. Some states and cities restrict ammunition purchases, require background checks or limit shipping, so check your local rules before you order.

Who It Is For

The Underwood 9mm +P+ 115gr Penetrator is a great fit for shooters who want high-performance 9mm Luger ammunition from an American maker known for powerful, accurate loads.

Buy the Underwood 9mm +P+ 115gr Penetrator at MAG5 Firearms

MAG5 Firearms is a family-owned FFL in Collegeville, Pennsylvania. Order the Underwood 9mm +P+ 115gr Penetrator online and we will ship it to you where state and local law allow, or browse our full selection of ammunition for more handgun loads. For factory details, visit Underwood Ammo.