Different Coax (RG-xxx)...
have different electrical and physical properties. The best suggestion I have is to decide what Coax type is needed, then go to the cable manufacturers web site and cross reference the coax type to the specifications for that coax. You should see an entry for weight-per-1,000 feet.
Some manufacturers are Alpha, and General Cable, but it is best to actually use the data tables from the coax manufacturer that you anticipate that you will actually use.