Your right about semi-wadcutter and wadcutter. I dont know CWC is.
I think Duracast might be a brand name, but Lee tumble lube bullets have small little lube grooves for a softer, more liquid lube and you dont have to size them.
If you can scratch the bullet easily with a finger nail, its fairly soft. If you push pretty hard on it and basically only make a mark, its considered hard. If you get a hardness tester, you will see a wide range of hardnesses.