That kind of practice will accustom you to how to effectively and quickly run the bolt. Especially if you aren't already familiar with the rifle. Different bolt action systems have a different feel to them. For instance, the Carcano action is cock-on-open design with a very aggressive primary extraction cam profile. Working the bolt on one feels very different than what you get using a cock-on-close design like an early Mauser or a Lee-Enfield.
Perhaps you didn't understand my question.
What's the advantage, if any, of practicing that with a live round in the clip -- in the chamber -- on the floor versus having nothing in the clip -- chamber -- on the floor?