Eli5: What’s the difference between a mag, clip, drum, round, etc when talking about guns?

Question

Also what does caliber mean in regards to bullets?

In: Technology

Answer 1

Caliber is the size of the bullet. High-caliber rounds are big.

A round of ammo is what most people think of as a “bullet”. It’s the bullet and the casing (and the propellant and primer), the whole package.

A mag/clip are the same thing (unless you’re a gun nerd, then the difference is the most important thing in the world apparently): the thing where rounds are loaded.

A drum is a big round magazine.