Why do shotgun shells have brass or steel encasing the base while

Would attaching shotgun shells to an arrow and firing it work? - Quora

What are TMJ and BEB Bullets?

What are the 5 components of a shotgun shell? - Quora

If shotgun shells are made of plastic, is there a risk that they might melt inside the magazine tube after prolonged shooting? Or is this not an issue with most modern shotguns?

Why are shotgun shells made of plastic? - Quora

Lead Ammunition Poses Real Risks. Why Won't Gun Owners Switch?

Remington 9mm Ammunition LeadLess LL9MM2 124 Grain Flat Nose Enclosed Base 50 rounds

How Do Shotgun Shells Work? What Are Shotgun Shells Filled With?

I got my grandpa Winchester model 25 12 gauge pump action shotgun and I'm trying to figure out if it should be able to fire steel birdshot or do I need to

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How do low brass and high brass shotgun shells differ? - Quora