It pretty hard to put proper cast. Very much anyway in a pre carve stock without a stock bending set up .
While drop does seem to be a lot different depending on the school, we should remember that a given school had a reasoning for that drop . That reasoning is based around the physical make up of the people in the original area . Thus the drop continued to be imparted by those studying a given school , needed or not .
The other reason for drop , was for a given style of shooting . A good example of this would be the differences in as a back and more erect French style compared to the forward English style
Cast, drop , pull and pitch of the toe , are all things concerning fit for a given person and style of shooting . So what works for physical type A , may not work for physical type C.
also the amount of cast needed should also take into consideration , the style of the buttstock . IE a thick buttstock with a tall cheek piece may call for more cast then a thin buttstock with a low cheek piece
Normally I don’t put pitch into the stock unless im building for a woman or an overly muscular man .
The woman being the more important of the two .Then only if its discerned that there may be an issue do to her physical make up