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12.7×42 Ammo – Designed for use in 50 BEOWULF® firearms



This 12.7×42 Ammo weighs 350 grains. This bullet leaves the barrel at 1775 feet per second. The ammo case is made from Brass. This 12.7×42 is a proven round for hunting.


Unveiling Power and Precision: The 12.7×42 Ammo and Bullet Guide

In the realm of firearms and ballistics, the 12.7×42 cartridge, also popularly known in gun circles as the “50 Beowulf,” stands out as a potent and formidable contender. Combining power, precision, and versatility, this ammunition has gained recognition among enthusiasts and professionals alike. In this particular page of our expansive ammunition guide, we delve into the details of the 12.7×42, or the .50 Beowulf ammo and bullet, exploring their features, applications, and advantages in the world of firearms.

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Understanding the 12.7×42 Cartridge

The 12.7×42 cartridge, frequently referred to as the Beowulf 50 or the 12.7mm Russian, is a centerfire cartridge designed for high-powered rifles and firearms. The numerical nomenclature denotes the bullet diameter (12.7mm) and the cartridge case length (42mm). This combination results in a round, known as the 50 Beowulf round, which offers impressive stopping power and range.

Key Features of the 12.7×42 Ammo

  • Powerful Impact: The 12.7×42 cartridge packs a punch, making it suitable for various applications including hunting, long-range shooting, and tactical operations.
  • Balanced Ballistics: With carefully engineered ballistics, this ammunition exhibits a balance between velocity, trajectory, and energy transfer, contributing to its accuracy and effectiveness.
  • Versatility: The versatility of the 12.7×42 cartridge is evident in its adaptability to both semi-automatic and bolt-action rifles, catering to different shooting preferences.

12.7x42 ammo

Exploring the 12.7×42 Bullet

At the heart of the 12.7×42 cartridge is the bullet, a meticulously crafted projectile that defines the cartridge’s performance characteristics, from the magazine to the barrel to the target. This large caliber bullet is the major component of the 50 Beowulf ballistic properties, making this round stand out.

Construction and Design

The 12.7×42 bullet is designed for controlled expansion upon impact, delivering terminal ballistics that are crucial for hunting, self-defense scenarios, and safeguarding the accounts of those who wish to protect life and property. The construction often includes a lead core encased in a sturdy copper or jacketed casing, ensuring not only an effective energy transfer but also minimizing the risk of over-penetration.


  • Hunting: Hunters favor the 12.7×42 bullet for its ability to take down large game with precision. The controlled expansion and deep penetration make it a reliable choice for ethical hunting practices.
  • Long-Range Shooting: When engaged in long-range shooting, accuracy is paramount. The 12.7×42 bullet’s ballistic characteristics, including its consistent trajectory, contribute to hitting targets at extended distances.

Advantages of the 12.7×42 Ammo and Bullet

  • Stopping Power: The combination of the 12.7×42 cartridge’s high velocity and the bullet’s controlled expansion results in remarkable stopping power, making it suitable for defense and tactical applications.
  • Accuracy: The consistent and predictable trajectory of the 12.7×42 bullet, coupled with its compatibility with various rifle platforms, enhances accuracy and overall shooting performance.
  • Multi-Purpose Use: Whether for hunting, target shooting, or personal protection, the 12.7×42 cartridge offers versatility that caters to a wide range of firearm enthusiasts.

12.7×42 Ammo: A Closer Look at Specifications

  • Bullet Weight: Typically ranging from 150 to 200 grains, the bullet weight influences factors like recoil, trajectory, and energy delivery.
  • Muzzle Velocity: The 12.7×42 cartridge achieves muzzle velocities in the range of 2,600 to 3,000 feet per second, contributing to its impressive ballistic performance.
  • Effective Range: With an effective range of around 800 to 1,200 meters, the 12.7×42 cartridge proves its mettle in scenarios requiring precision at extended distances.

Exploring Ammunition Variants

Several ammunition manufacturers offer variants of the 50 Beowulf ammo, each with distinct features tailored to specific applications. These products range from standard rounds to specialized ammunition like the 50 Beowulf round, designed for unique tasks.

Hollow-Point Ammo

Hollow-point 12.7×42 ammunition, a common product in the 50 Beowulf lineup, is designed to expand upon impact, creating a larger wound channel and transferring more energy to the target. This variant is favored for self-defense and hunting due to its enhanced stopping power.

Armor-Piercing Rounds

Armor-piercing 12.7×42 rounds are engineered to penetrate hard targets, such as armored vehicles or barriers. These specialty 50 Beowulf ammo rounds are used in tactical scenarios where overcoming obstacles is essential. Gathering the right equipment, down to the exact caliber and right reload, can make a significant difference in these situations.

Product Overview

While taking advantage of state of the art testing equipment, this high-performance ammunition by Underwood is field-tested using popular real firearms that customers are most likely to own out in the real world with all the elements you would experience. If for some reason Underwood Ammunition, including their .50 Beowulf Ammo, fails to meet performance expectations, Underwood stands by their product 100% and will make sure the customer is satisfied with every purchase. Notably, the 12.7×42 ammunition, or the 50 Beowulf as it’s commonly known, is new production, non-corrosive, in boxer primed, reloadable brass cases. The term “50 Beowulf” is a registered trademark by Alexander Industries.

Hornady XTP bullets were designed for hunting, self-defense, and law enforcement. One of the great things about the XTP bullet is reliable performance, it features controlled expansion where six serrations divide the bullet into six symmetrical sections. These sections weaken the jacket to allow controlled expansion at low velocities and ensures fragmentation does not occur at high velocities. The XTP bullet is really known for its stopping power. They were designed from the beginning to expand reliably at a variety of handgun velocities and deliver deep, terminal penetration with every shot. Most handgun bullets are designed to perform at a single factory-specified velocity where the XTP bullet is designed to offer controlled expansion over a range of velocities. Each XTP Bullet has a swaged core and drawn copper jacket to ensure uniform expansion and in-flight stability. Adding a cannelure to this bullet keeps the core and the jacket locked together while also allowing the cartridge case to tightly crimp, adding security at high velocities. All of Underwood Ammo rounds utilize flash suppressed powder so that your vision will not be compromised if it becomes necessary to use your firearm in low light.

The 12.7×42, or .50 Beowulf ammo and bullet combination exemplifies the marriage of power and precision in the world of firearms. With its versatility, stopping power, and accuracy, this cartridge has solidified its place in hunting, long-range shooting, and tactical operations.

Underwood AmmunitionQ1: Can the 50 Beowulf ammo be used in various rifle platforms?


Product Information

Cartridge 50 Beowulf
Grain Weight 350 Grains
Quantity 20 Round
Muzzle Velocity 1775 Feet Per Second
Muzzle Energy 2449 Foot Pounds
Bullet Style Jacketed Hollow Point
Bullet Brand And Model Hornady XTP
Lead Free No
Case Type Brass
Primer Boxer
Corrosive No
Reloadable Yes
G1 Ballistic Coefficient 0.145
Sectional Density 0.192
Velocity Rating Supersonic

Delivery Information

Shipping Weight 1.625 Pounds
DOT-Regulated Yes


A1: Yes, the 50 Beowulf ammo is compatible with both semi-automatic and bolt-action rifles, offering adaptability and flexibility to shooters.


Q2: What is the primary advantage of using hollow-point 50 Beowulf ammo?

A2: Hollow-point ammunition offers enhanced stopping power and energy transfer upon impact, making it suitable for self-defense and hunting purposes.

Q3: Are there restrictions on the civilian use of armor-piercing 50 Beowulf rounds?

A3: Yes, the use of armor-piercing ammunition is often regulated and may be restricted for civilian use in certain jurisdictions due to its potential for penetrating hard targets.

In the realm of ammunition, the 12.7×42, or 50 Beowulf, stands tall as a testament to engineering and precision, embodying the essence of power and performance. Whether on the hunt or at the range, the 50 Beowulf continues to leave its mark on the world of firearms.

A3: Yes, the use of armor-piercing ammunition is often regulated and may be restricted for civilian use in certain jurisdictions due to its potential for penetrating hard targets.

In the realm of ammunition, the 12.7×42 stands tall as a testament to engineering and precision, embodying the essence of power and performance. Whether on the hunt or at the range, this cartridge continues to leave its mark on the world of firearms.

Additional Information


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