New Slug Technology
The widespread availability of rifled shotgun barrels was quickly followed by the introduction of special slugs designed for use with the rifled barrels. The short, fat, unaerodynamic Foster slug was no longer needed for its inherent stability; new slugs were smaller in diameter, usually 12.7 millimeter (.50 caliber) (compared to the 18.5 millimeter (.73 inch) bore diameter of a 12 gauge), and carried in a plastic sabot. The saboted slug had half the frontal area of the old slugs, which translated to half the drag, and double the penetration. Lighter, faster slugs were also possible, allowing for a flatter trajectory and longer range. With the wide selection of barrels, shotshells and slugs, the modern shotgun is a tremendously versatile tool.
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