Zirconium or magnesium shavings are the primary components of pyrotechnic shotgun rounds. When ignited, these metals react violently with oxygen, producing a spectacular shower of sparks and flames upon exiting the muzzle. This effect is often sought after for visual displays and signaling, although its practical applications are limited.
The incendiary nature of such ammunition necessitates careful handling and usage. While visually striking, the shower of sparks generated poses a significant fire hazard, especially in dry or vegetated areas. Consequently, its use is often restricted or prohibited. Historical context suggests its use in signaling and illumination, but modern alternatives have largely superseded such roles due to safety concerns.