That chart comes from a very good article on RW by the Ala Co-op Ext. at the link above.

Greg I thought you meant you only had a LMB RW chart on your site while I knew you had RW charts/info for both BG and LMB.

I have some Fla LMB info for age and size. Here is the problem for Fal LMB. RW are from an average of LMB. Northern males and females are relatively close in size so averages work well. However the differences between female and male Fla LMB is much greater and can skew the RW chart/concept.