Breaking Down: Why Aren’t Bullets Made with Uranium?

Ever wondered why uranium (with all its heavyweight glory) isn’t making its way into our bullets? Today, I’m going to answer the peculiar question: Why aren’t bullets made with uranium? You might be surprised to learn that, in some cases, they are.

Let’s unravel this mystery and explore the unique characteristics of depleted uranium, a material that has found its way into certain types of ammunition.

Depleted Uranium: A Heavyweight and Only Contender

So, what makes depleted uranium stand out in the ammunition realm? First off, it’s important to clarify that depleted uranium is a specific form of uranium. And yes, it is indeed used in the production of bullets, specifically armor-piercing rounds. Unlike its radioactive cousin, depleted uranium is less prone to fission. That’s making it a safer option for practical use.

The Unique Performance of Depleted Uranium

1. Self-Sharpening Property

One of the standout features of depleted uranium projectiles is their self-sharpening property. Imagine a bullet that doesn’t disintegrate or squash upon impact but, instead, sharpens itself like a pencil.

This unique characteristic is a result of adiabatic shear, a process where the projectile and the target experience different shear strengths. The projectile, having a higher shear strength, forms a long, thin rod that can pierce through armor without losing its shape.

2. High Density and Hardness

Depleted uranium boasts a density and hardness that surpass lead and many other materials used in bullet production. This high density translates to increased kinetic energy delivered to the target upon impact.

In simpler terms, depleted uranium packs a powerful punch. It is an ideal choice for projectiles that need to penetrate tough armor, such as that found on tanks and armored personnel carriers (APCs).

3. Resistance to Neutron Absorption

Another key characteristic of depleted uranium is its low neutron capture cross-section. This means it doesn’t easily absorb neutrons. Thus it is suitable for shielding nuclear reactors and warheads from radiation.

This property, along with its high melting point and low thermal expansion coefficient, makes depleted uranium a robust material that can withstand high temperatures and pressures without deforming or cracking.

Why Are Some Bullets Made of Depleted Uranium?

Depleted uranium is a preferred choice for making bullets, especially in armor-piercing rounds, due to its exceptional properties. Its hardness, density, and self-sharpening characteristics make it ideal for penetrating armor effectively.

Properties that Make Depleted Uranium Ideal

1. Hardness and Density:

  • Depleted uranium is harder and denser than lead, so it provides superior kinetic energy upon impact.
  • This increased density leads to higher kinetic energy and enhances the destructive capability against armored targets.

2. Self-Sharpening Nature:

  • Unlike most bullets that disintegrate or squash upon impact, depleted uranium bullets maintain their shape and sharpen as they penetrate.
  • The unique self-sharpening property minimizes resistance and allows the bullet to pierce deeper into the target.

3. Effective Armor Penetration:

  • When used in anti-tank shells (such as those for the M1 Abrams) depleted uranium’s self-sharpening feature ensures effective armor penetration.
  • The material shaves off the sides like sharpening a pencil, creating a long, thin rod that can pierce through armor.

How Depleted Uranium Rounds Are Made?

1. Depleted Uranium Composition

  • Depleted uranium is primarily composed of 238U, the most stable isotope of uranium.
  • Traces of 235U (fissile isotope) and 234U (decay product of 238U) are present.

2. Manufacturing Process

  • The projectile undergoes a process called adiabatic shear during impact, sharpening itself as it cuts through metal.
  • Different shear strengths between the projectile and the target result in the formation of a long, thin rod that pierces armor.

3. Ignition and Combustion

  • The impact generates heat and friction, causing the projectile and target to ignite and burn.
  • This combustion produces gases that rapidly expand, creating a shock wave that contributes to a secondary explosion within the target.

4. Low Neutron Capture Cross-Section

Depleted uranium has a low neutron capture cross-section. So it is suitable for shielding nuclear reactors and warheads from radiation.

Are Uranium Bullets Made Completely Out of Uranium?

Uranium bullets are not typically made completely out of uranium; instead, they often feature a uranium core surrounded by other materials.

A prime example is the GAU-8 30mm ammunition, which is a well-known depleted uranium (DU) round. Let’s dive into the composition and construction of uranium bullets, and shed light on the reasons behind this design.

Composition of Uranium Bullets

1. Core Material:

  • The core of uranium bullets, like those in the GAU-8 round, is primarily composed of depleted uranium (DU).
  • Depleted uranium is chosen for its exceptional density, hardness, and self-sharpening properties, making it effective for armor-piercing purposes.

2. Outer Jacket and Sabot:

  • Uranium bullets are often encased in an outer jacket or sabot made of lighter materials, such as aluminum or plastic.
  • The jacket serves multiple purposes, including protecting the barrel of the firearm from wear and tear caused by the hardness of the core material.

3. Sabot as a Protective Layer:

  • The sabot is made from lighter materials. It ensures that the hard uranium core does not directly contact the rifled steel barrel.
  • Using materials like aluminum in the sabot minimizes the risk of damaging the barrel during firing.
PGU-14 API- Bullets Made with Depleted Uranium
Figure: PGU-14 API

Examples of Uranium-Made Bullets

  • The US M829 is a notable example of a depleted uranium round that incorporates a sabot made of plastics.
  • In some Russian rounds, aluminum is used as a sabot material to protect the barrel from the hardness of the uranium core.

Barrel Protection and Accuracy Considerations:

  • The use of an outer jacket or sabot is crucial for protecting the rifled steel barrel of the firearm.
  • Firing a projectile with a core harder than steel without a protective layer can lead to premature wear on the barrel.
  • Rifled barrels are essential for accuracy, as the grooves in the barrel impart a spin on the bullet, stabilizing its trajectory.
  • Protecting the rifling from wear is vital for maintaining accuracy over extended use.

The Depleted Uranium Bullet in Action

Military and Tactical Use

From a military perspective, depleted uranium is a game-changer, especially in armor-piercing applications.

The M1 Abrams, a renowned main battle tank, utilizes depleted uranium in its anti-tank shells. The self-sharpening property, high density, and hardness make it an effective choice for defeating the armor of modern tanks and APCs.

Tactical Considerations

Tactical considerations play a vital role in ammunition selection. The reliability of conventional materials like lead and copper has kept them in use for various applications.

While depleted uranium brings remarkable capabilities, its use is strategic and targeted, ensuring that the benefits outweigh the potential complications.

Legal and Ethical Considerations: Are Depleted Uranium Bullets Legal?

You know that Depleted uranium bullets are very expensive. They are illegal for civilians due to their potential risks and specialized use in most parts of the world.

As much as we’d love to load up our magazines with uranium-tipped rounds, the international community has something to say about it. There are regulations in place that restrict the use of uranium in certain applications, and ammunition is one of them.

Arms control agreements and international treaties frown upon the use of uranium in conventional weapons. It’s like having a heavyweight boxer wear brass knuckles – it’s just not fair play, and the global community agrees on playing by the rules.

Plus, imagine the public outcry if they found out their everyday bullets had a radioactive twist. It’s not just a PR nightmare; it’s a legal and ethical conundrum. The potential harm to both individuals and the environment would stir up a storm that no amount of firepower could weather.

For Making Bullets or Magazines: Alternatives to Uranium

While uranium may be sitting on the bench, there’s no shortage of materials stepping up to the plate in bullet production.

  • Lead and copper have been the go-to choices for years, offering a balance of weight, malleability, and affordability. They may not have the radioactive allure, but they get the job done without causing logistical headaches.

But it’s not all about the classics. Researchers are exploring alternative materials that bring a fresh perspective to bullet design. From polymers to composite materials, the world of ammunition is evolving, and who knows, we might stumble upon the perfect blend that combines the best of both worlds – effectiveness without the radioactive baggage.

Depleted Uranium: The Future of Ammunition?

As technology advances and research in ammunition materials continues, who’s to say what the future holds? Perhaps breakthroughs in manufacturing techniques or the discovery of new materials will bring about innovations that further redefine the world of ammunition. Until then, let’s appreciate the intricacies of depleted uranium and its role in pushing the boundaries of bullet performance.

Additional FAQs

Can Uranium Be Used in Bullets?

Yes, uranium, specifically depleted uranium, can be used in bullets. Depleted uranium is utilized on the tips of tank shells, bullets, and mortar rounds to enhance their penetration capabilities.

Depleted uranium projectiles ignite after contact. The UK Ministry of Defence states that depleted uranium missiles were developed in the 1970s and have been used in conflicts such as the Gulf War (1991), Kosovo (1999), and the Iraq War (2003).

What Is the Point of Uranium Bullets?

Uranium bullets AKA depleted uranium (DU) serve a crucial military purpose. The key point of using uranium bullets is to leverage their density for increased armor-piercing effectiveness in military applications, particularly in tank warfare scenarios.

Depleted uranium, a byproduct of uranium enrichment, retains chemical toxicity similar to natural uranium but is depleted of about 40 percent of its radioactivity.

How Toxic Is Depleted Uranium Ammunition?

Depleted uranium ammunition can pose a potential health hazard due to its toxicity and radioactive nature. External exposure is minimal and generally not harmful. But if DU enters the body through embedded fragments, contaminated wounds, or inhalation/ingestion, it becomes a serious concern.

DU emits alpha particle radiation, harmful if inside the body, it can damage kidneys and, recently observed, impact bone mineral density. While health impacts, especially on kidneys, have been noted in uranium manufacturing workers, the specific health effects from DU exposure require ongoing research and monitoring.

Do Depleted Uranium Rounds Explode?

No, depleted uranium rounds do not explode themselves. When fired, a depleted uranium munition cuts through tank armor due to its extreme density, creating high-speed impacts. It ignites after contact, and then leading to soaring temperatures that can cause the tank’s fuel and ammunition to explode.

The International Atomic Energy Agency advises minimizing handling, wearing protective apparel, and addressing potential health risks, mainly kidney damage from inhaled or ingested particles. The clarification emphasizes that the munition ignites after contact, potentially causing an explosion.

Is it Legal to Own Uranium in the US?

Yes, it is legal to own uranium in the United States. Individuals are permitted to possess up to one ton of natural uranium ore minerals without restrictions on activities, as long as the samples are naturally occurring.

This legality applies to the ownership of uranium in its natural state. And, it is subject to regulations governing the possession of minerals.


The question of why bullets aren’t made with uranium isn’t entirely accurate. Depleted uranium’s remarkable properties, including its hardness, density, and self-sharpening nature. It is an exceptional choice for armor-piercing bullets. The composition of uranium bullets involves utilizing depleted uranium primarily in the core. It is often encased in materials like aluminum or alloys to ensure effective and controlled use in firearms.

While cost and legality limit its widespread civilian use, the military strategically leverages these characteristics for effective penetration against heavily armored targets.

Stay locked, loaded, and always curious, my fellow firearms aficionados!