There are many different types of shotgun shells and this makes it hard to understand exactly how they're made and what they're designed for.
Understanding Shotgun Shells
Shotgun Shells and Ammunition Archives - The Shooter's Log
Shotshells 101 An Official Journal Of The NRA
Shotgun Shells 101
Understanding Shotgun Ammo
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Shotshells 101 An Official Journal Of The NRA
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