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Cake day: February 21st, 2026

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  • I do know what I’m talking about. Your link is incorrect. What you’re showing me a photo of is an ammo cartridge. A cartridge contains a bullet, a casing, gunpowder, and a primer. The part labelled projectile is the bullet. Not all projectiles are bullets, but all bullets are projectiles. The (typically brass) casing houses the gunpowder and the bullet is seated in the opening of the casing, with the primer at the closed end. All these components together is called a cartridge. You can buy bullets on their own, sure, but if you just buy a box of bullets all you are getting is the projectile. If you buy a box of ammo, you are buying a box of cartridges.