One old:
Metallic Cartridge Nomenclature
and one from the latest Handloader:
There Are No .32, .38 or .44 Calibers
When I first got into shooting I was bewildered by all the cartridge names
and the fact that many times they don't accurately describe much of anything.
This is probably a universal symptom.
I read "Cartridges Of The World" several times.
Then I got other reference books, some about cartridge conversion where the dimensions are super important.
Slowly I learned the basics of the families I was interested in especially revolver rounds, the 44 in particular.
The above articles have some cool historical background some of which I never read before.
Recommended.