I think I know the answer, but that can get you into trouble, so I figured this was the perfect place to ask...
Hammock support line strength. It seems I remember the general rule of thumb was you determined the weight limit of the hammock lines by dividing the line strength of the material by a factor of five. So 1600lb strength rope would get you at ~320 pound limit for your hammock (as long as the material of the body would hold up).
Now I'm working a review of a hammock system and the manufacturer told me his line strength was 770 pounds, given my uneducated beer math formula that would mean the load of the hammock lines limit the user weight to 152 pounds, but the manufacturer claims a load limit of 350 pounds.
That said, when I looked up the specs on the rope I thought he was using, it was 1600 pounds. I'm wondering what the disconnect is here.