Not to forget the MK47.
In short there are two types.
The so called “LV” (low velocity) in 40x46. Used in weapons like the M203 and M79 and all related types all over the world.
The so called “HV” (high velocity) in 40x53. Used in automatic grenade launchers like the MK19 and MK47 and many others.
There a new one upcoming called the “MV” (medium velocity) which shall be the successor of the LV. It will use the same case (40x46) but has a higher velocity and the weapons will be new ones. As I understood the development was initiated by FN in Belgium. They still have problems to get an acceptable recoil with weapons using it. I wonder if that one will go anywhere.