Here's a break down of some terms such as gauge, brass and length, which can help you better understand shotguns and shotgun shells.
Shotgun Shells Explained - NSSF Let's Go Shooting
Competitive Shooting: Everything You Need to Know to Get Started
Competition Shooting Guide: Competition Overview - Pew Pew Tactical
Let's get the Conversation Started—Project ChildSafe Releases New Firearm Safety Video - The Shooter's Log
What's 'Dram Equivalent' Mean? - Shotgun - NSSF Let's Go Shooting
Choosing the Best Shotgun Shells
Definition of what's an 'assault weapon' is a very contentious issue
The Death of a Gun-Rights Warrior - The Atlantic
Shooting Clays How to Hit a Moving Target - NSSF Let's Go Shooting