I found that the Cuban Cigar Website has a nice list of average weights per "Factory Name". It is really a nice resource. Checking the data, however, suggests that some of these values might not be correct. For instance, if I plot approximate volume against reported weight there are 4 obvious outliers. There is of course a large variation in weights across individual cigars, but these outliers are >60% off the mark. I am guessing that the reported weights for these are typos, however since I don't have access to some of the actual sticks, I cannot weigh for myself.
If someone has some of these sticks and a scale I would be interested to know your observed weights. The expectation here is that the reported weights are all too low.
Duke 54 × 140mm (5½″): Reported Weight: 7.14 grams
Partagas Serie E No.2
Hermosos No.4 48 × 127mm (5″): Reported Weight: 5.30 grams
Choix Suprême, Connie 1, Picadores, Exhibicion No.4
Petit Coronas 42 × 129mm (5⅛″): Reported Weight: 4.14 grams
Regalias, Mille Fleur
Palmitas 32 × 152mm (6″) Reported Weight: 3.30 grams
La Gloria Cubana MdO No 4