A Tannerite explosion is the detonation of a binary explosive target, sold as a kit with two separate powders that become explosive only when mixed together and struck by a high-velocity bullet. The brand name “Tannerite” has become a catch-all term for these targets, much like “Band-Aid” for adhesive bandages. When hit, the mixed powder produces a loud blast and a visible cloud of vapor, giving shooters instant confirmation of a hit from long range.
What Tannerite Is Made Of
Tannerite is a proprietary blend of two main ingredients: ammonium nitrate (an oxidizer) and aluminum powder (a fuel). These two components are packaged separately and are individually stable. Neither qualifies as an explosive on its own under federal law. Once you mix the powders together, though, the result is a genuine explosive material. The mixture sits inert until a high-velocity impact, typically from a centerfire rifle bullet traveling above roughly 2,000 feet per second, triggers the detonation. A hammer blow, a dropped container, fire, or a pistol round will not set it off under normal conditions.
How Powerful the Blast Is
Compared to conventional military and industrial explosives, Tannerite is relatively low-powered. Researchers measuring its explosive output found that its TNT equivalence ranges from about 0.18 to 0.71, depending on the measurement method. In practical terms, that means a given weight of mixed Tannerite produces somewhere between one-fifth and three-quarters of the blast energy of the same weight of TNT. It also has very low “brisance,” the shattering force that makes high explosives cut through steel. In lab plate-dent tests, Tannerite failed to even register a value, confirming it doesn’t produce the kind of focused, metal-cutting shock wave that demolition charges do.
That said, the blast is far from harmless. A standard half-pound target produces a concussion strong enough to be felt at a distance, and larger quantities can hurl debris, shatter nearby objects, and cause serious injury. A case report published in a forensic medical journal documented severe blast injuries from a Tannerite target, including wounds consistent with the pressure wave and flying fragments. The danger scales with the amount mixed: doubling the quantity more than doubles the risk, because both the pressure wave and the shrapnel zone expand significantly.
Why People Use Exploding Targets
The primary use is long-range target shooting. At distances of 200, 300, or even 500 yards, it’s difficult to see whether a bullet struck its mark. An exploding target solves that problem instantly with a visible puff of vapor and a sharp report. Competitive shooters, recreational marksmen, and firearms trainers all use them for this reason.
They’ve also become popular for gender-reveal events and similar celebrations, where the colored smoke from a modified target creates a dramatic visual. This use has led to several well-publicized accidents and wildfires, which in turn prompted new restrictions in some areas.
Federal Legal Status
The ATF treats binary explosive targets with a clear dividing line: unmixed components are unregulated, but mixed components are explosives subject to federal law. Here’s how that plays out in practice.
- Buying the kit: No license or permit is required. The ATF does not regulate the sale of the separate components, even when sold together in a kit.
- Mixing for personal use: Combining the two powders legally counts as “manufacturing explosives,” but individuals mixing for their own personal, non-business target practice do not need a federal explosives license.
- Mixing for business use: Anyone mixing binary explosives for sale, distribution, demonstration, or testing must hold a federal explosives manufacturing license.
- Transporting after mixing: Once mixed, the material is a regulated explosive. You need a federal explosives license or permit to transport it, even just driving it to a shooting range.
- Storage: Mixed binary explosives must be kept in an approved explosives storage magazine unless they are actively being used or moved to a place of use.
- Prohibited persons: Anyone barred from possessing explosive materials under federal law (certain felons, for example) may not possess mixed binary targets.
The practical takeaway is straightforward: buy the kit, bring it to your shooting location unmixed, combine the powders on-site, and use it immediately. That sequence keeps you within federal guidelines without needing any license. Mixing it at home and then driving it somewhere else crosses a legal line.
State and Local Restrictions
Beyond federal rules, many states, counties, and municipalities have added their own restrictions. Some states have banned or limited the sale of binary targets outright, while others restrict their use during high fire-risk seasons or on public land. Local burn bans and noise ordinances can also apply. Because these laws change frequently and vary widely, checking your state and county regulations before purchasing or using exploding targets is essential.
Common Risks and Injuries
Most injuries from Tannerite involve people detonating targets at too close a range or using far more than the recommended quantity. The blast wave from even a half-pound target can cause hearing damage at close distances, and flying debris from whatever the target was placed on or near (rocks, metal, wood) becomes high-velocity shrapnel. Several reported injuries have involved people shooting targets from 25 or 50 yards when the manufacturer recommends a minimum of 100 yards for a standard half-pound target, with greater distances for larger amounts.
Wildfires are another significant risk. Although the chemical reaction itself is not incendiary by design, the heat and blast can ignite dry grass, brush, or forest litter. Multiple large wildfires in the western United States have been traced back to exploding targets used during dry conditions, leading some national forests and state agencies to ban them seasonally or year-round on public land.
Using quantities well above the standard half-pound target dramatically increases danger. Videos of people detonating multiple pounds at once are common online, but the shrapnel radius, overpressure zone, and fire risk all grow with the charge size. The manufacturer’s own guidelines cap single-target weight for a reason.