What is 'headspace'?

Headspace is something I struggled to understand at first, especially, when I load all sorts of cartridges, but when reading about it, everyone seems to discuss one specific type, missing the others.

This is mostly a reference for me, but I thought a lot of people will find this very useful.

Headspace

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This appears to be a rimmed cartridge, and it’s just a guess of course, but I would presume that headspace is determined by the rim of the case.

The video discusses all types of headspace…

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https://www.youtube.com/watch?v=J05zqzZhgtc