Cartridge (pistol) gauges vs case gauges. What's the difference?

In this video we talk about the differences between a case gauge and a cartridge or pistol gauge. The two are sometimes confused. I focus on those made by L.E. Wilson, but there are others.

Here's a link to the SAAMI standards site. Click the link there for the "performance standards" for the firearm type you are interested in. All the info, including cartridge and chamber dimensional drawings like you see in this video can be found there.

https://saami.org/technical-information/ansi-saami-standards/