Description
The Underwood 357 Mag 140gr Penetrator load, Underwood item 836, is a 20 round box of 357 Magnum ammunition loaded with a 140 grain Xtreme Penetrator bullet rated at 1550 fps with 747 ft-lbs of muzzle energy.
Underwood 357 Mag 140gr 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 handgun hunting, protection in bear country and other situations where deep penetration matters most. It also serves as a personal protection load. 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 357 Magnum. Always check the caliber marking on your barrel or slide before loading. Underwood loads run at the upper end of safe pressure for the cartridge, so make sure your firearm is in good condition.
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
Expect heavy recoil and a loud, bright muzzle blast with this load. A firm grip and a heavier firearm help with control.
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: 836
- Caliber: 357 Magnum
- Bullet weight: 140 grain
- Bullet type: Xtreme Penetrator (solid monolithic copper)
- Muzzle velocity: 1550 fps
- Muzzle energy: 747 ft-lbs
- Case: Nickel
- Lead-free: Yes
- Count: 20 rounds per box
- UPC: 816874020170
- Made in the USA
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 357 Mag 140gr Penetrator is a great fit for shooters who want high-performance 357 Magnum ammunition from an American maker known for powerful, accurate loads.
Buy the Underwood 357 Mag 140gr Penetrator at MAG5 Firearms
MAG5 Firearms is a family-owned FFL in Collegeville, Pennsylvania. Order the Underwood 357 Mag 140gr 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.
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