Shot/slug - case - powder - wad - primer. Types of Shotgun Shells? Things you must consider when selecting the correct Shell? Steel or lead shot?
How to Choose Shotgun Shells and Chokes: 11 Steps (with Pictures)
Parts of a Shotgun: A Complete Guide
What are the basic Parts of a Shotgun Shell?
Basic Components of Shotgun Shell
Parts of a Shotgun: A Complete Guide
Know Your Shotgun Parts - How Shotguns Work
ANATOMY OF A SHOTGUN SHELL - PullUSA Magazine
Tip: Basics of a Pump Shotgun An Official Journal Of The NRA
Basic Gun Terminology –
Shotgun Shooting Techniques - Swing Through - Sustained Lead - Snap