Spencer17 took the words right out of my mouth - If you can shut the doors an an R44 it'll fly!
Seriously though, due to the fact that you have no baggage compartment in an R44 & everything must be carried within the confines of the cabin, as long as you don't exceed the weight limitations of the seats it will remain within CofG from full fuel through to empty. I don't think this rule of thumb will stand up in a court of law though!