Crossbow draw weight chart.

In regards to the questions I asked the other day concerning crossbows, and the draw weight chart for the prod (bow) part of the crossbow for a laminated prod. I found this information located at "Alchem Incorporated".
Their webb site is www.alcheminc.com/crossbow.html#
They have available all the internal, and external parts needed to build your own medieval crossbow with the exception of the wood which you would supply.
Additionally, they have an excellent draw weight chart on line that goes from 50# all the way up to 250# for the crossbow builder. The chart is for prods made out of spring steel which they produce.
I would still like to locate a chart for prods utilizing laminated wood and fiberglass for some crossbows I wish to make. Good luck John