Also what does caliber mean in regards to bullets?
In: Technology
A round is another word for [cartridge](https://en.wikipedia.org/wiki/Cartridge_(firearms)) (i.e. a bullet with its propellant).
A [magazine](https://en.wikipedia.org/wiki/Magazine_(firearms)#Drum) is a box that holds cartridges and feeds them into the firearm. In modern weapons the magazine is typically removable but in older guns it might be fixed.
A drum is a round magazine that packs its cartridges into a spiral shape.
A [clip](https://en.wikipedia.org/wiki/Clip_(firearms)) is a piece of metal that holds several cartridges together, primarily for the purpose of quickly reloading a magazine (especially if the magazine itself is not removable from the gun). This is the term that is misused the most; a lot of people say “clip” when they mean “magazine,” unless they’re referring to very particular firearms that are/were reloaded with clips, such as the M1 Garand.
Edit: I forgot caliber; that’s just a measure of the size of a bullet. Usually it’s the internal diameter of the barrel (though that can be measured in multiple ways). E.g. “.45 caliber” means a 0.45-inch (~11.43mm) diameter bore.
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