Regular shad raps which are Balsa run alot shallower than the RSR,GSR&JSR’s which are all a composite material.Variables such as line diameter & speed will affect diving depths & performance as well.Just off the top of my head I would say you need about 150’to get a #7 reg shad rap to 15’on 10lb dia.line @2mph.RSR & GSR about 100′ & JSR about 90′.Running 10lb braid you can knock off about 20% length to acheive similar depths!Hope this helps.