Definition
A pellet (air gun) is a small, typically sub‑caliber projectile designed specifically for propulsion by compressed gas or spring‑driven mechanisms in air‑guns. Unlike conventional bullets, air‑gun pellets are often shaped with a hollow skirt (diabolo) to provide aerodynamic stability and to engage the rifling of a barrel.
Overview
Air‑gun pellets are used in a variety of shooting activities, including target practice, small‑game hunting, and competitive sport shooting. They are manufactured from materials such as lead, lead alloys, tin, polymer, or a combination thereof. Pellets are produced in standardized calibers, the most common being .177 in (4.5 mm) and .22 in (5.5 mm), though other sizes such as .20 in (5.0 mm) and .25 in (6.35 mm) also exist. Modern air‑gun designs employ either pneumatic (pre‑charged pneumatic, PCP), CO₂, or spring‑piston powerplants, each influencing pellet performance characteristics such as velocity, accuracy, and energy transfer.
Etymology/Origin
The term “pellet” derives from the French pellet, a diminutive of pelle meaning “small ball” or “shot,” itself originating from the Latin pila (ball). In the context of firearms, “pellet” began to be applied in the late 19th to early 20th centuries to denote the miniature projectiles used in early pneumatic guns, distinguishing them from larger lead shot used in shotguns.
Characteristics
| Feature | Typical Details |
|---|---|
| Shape | Primarily diabolo (waist‑narrowed centre with a hollow skirt) for stability; alternatives include slug (solid) and domed (ball‑nose) designs. |
| Material | Lead alloys (often with antimony or tin), pure lead, tin, polymer, or hybrid composites (e.g., polymer core with metal jacket). |
| Calibers | .177 in (4.5 mm) – standard for target shooting; .22 in (5.5 mm) – favored for hunting; .20 in and .25 in for specialized applications. |
| Weight | Ranges from about 5 grains (0.32 g) for light target pellets to 30 grains (1.95 g) for heavy hunting pellets. |
| Velocity | Typical velocities span 500–1,200 ft/s (152–366 m/s) depending on gun powerplant and pellet weight. |
| Ballistic Coefficient | Generally lower than that of conventional bullets due to lightweight construction and diabolo shape; performance optimized for short‑ to medium‑range (< 50 m). |
| Safety Considerations | Lead‑based pellets pose health risks; many jurisdictions encourage or require the use of non‑lead alternatives. |
Related Topics
- Air gun – A firearm that uses compressed gas, CO₂, or a spring‑driven mechanism to launch a projectile.
- Diabolo (projectile) – The specific aerodynamic profile common to many air‑gun pellets.
- Ballistics – The study of projectile motion, encompassing internal, external, and terminal phases relevant to pellet performance.
- Pneumatic air rifle – An air‑gun type that typically employs pre‑charged pneumatic (PCP) systems, often paired with high‑precision pellets for competition.
- Lead poisoning – Health considerations associated with the use of lead‑based pellets, leading to the development of alternative materials.
- Small‑game hunting – One of the primary civilian uses of higher‑caliber pellets for ethically harvesting small mammals.