Why are shotgun shells made out of plastic while rifle shells are

Why are shotgun shells made out of plastic while rifle shells are made of metal? - Quora

Winchester Model 12 Shotgun: The Other Trench Gun - Firearms News

What's the difference between a 3 inch and 3 1/2 inch shotgun shell? - Quora

Why do shotgun shells have brass or steel encasing the base while the rest of the shell is composed of paper or plastic? Is it necessary? - Quora

What are certain shotgun shells used for? - Quora

Toy Gun with Soft Bullets, Shell Ejecting Foam Bullet Blaster Toy Pistol Model, Non-Aggressive Shooting Game Educational Toys Gifts for Kids Boys Girls Adults Ages 14+ (Green) : Toys & Games

Why do shotgun shells have brass or steel encasing the base while the rest of the shell is composed of paper or plastic? Is it necessary? - Quora

What were shotgun cartridges made of before plastic existed? - Quora

Shotgun shell - Wikipedia