Why doesn't the shell casing of a bullet expand when the bullet is

Why doesn't the shell casing of a bullet expand when the bullet is

Ammo 101: The 4 Parts Of A Cartridge - Pew Pew Tactical

Why do bullets needs to have shells/casings? - Quora

Would a molten plastic filling of the cavity on a hollow point bullet make it expand more reliably, since it doesn't rely on impacting against fluid to do so? - Quora

Ammo casings are a source of much debate and confusion.

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What does an unspent bullet round mean? - Quora

Given the length of protuberance from the case, why doesn't the 6.5x52mm Carcano bullet start tumbling at some point immediately after the round exits the rifle barrel? - Quora

Best Ammo for 1911 45 ACP Chosen by Experts at

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When was the first bullet gun made? - Quora

980+ Bullet Casings Stock Photos, Pictures & Royalty-Free Images

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Smoking Bullet Casing Stock Photo - Download Image Now - Bullet, Bullet Cartridge, Gun - iStock

How to extract a bullet from the shell casing without firing the gun - Quora

Bullet casings from a 5mm pistol, Military Stock Footage ft. 5mm & ammunition - Envato Elements