There's basically the main 5 sizes:
Midget (custom short for the Hornets and the like - BRNO ZKW465 etc)
Short
Long
Magnum
F**k my shoulder (dinosaur calibers and chamberings that are usually mounted on ships, tanks or aircraft).
There have been a few Intermediate length actions, notably Mauser M96 Swedish small ring and M48 post war large ring actions but to my knowledge no one manufactures this length currently.
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