It is also pretty hard to put the cg precisely where you want it to get the "best range" spot - people sit where they want to, though you can tell the fat slug to move into the back. Mostly the pilot simply confirms that the bird is in limits, and launches off. The range of a helicopter is affected to a very small amount by the cg, probably wouldn't notice it. We usually fly at fast cruise, rather than puttering along for range - unless fuel quantity is dire.
However, I did have a case where the range was affected by the cg. An engineer wanted to do a blade track in flight, using the strobe from the front seat. The engineer was obese, and when I picked up to the hover, the cyclic was almost back on the stops, so we didn't fly.
CG on forward limit, Range = zero.