For those trying to stick to a particular "school" stock fit might be out of the question, especially with some of the styles that were not really designed with fitting a human in mind. Even if someone is buying the gun to shoot, chances are he/she has no idea of what fits properly and what does not. I had the opportunity to witness that this past weekend.
Coming from a "modern" stockfitting background, I have sought out "authentic" styles that are more appropriate to good shooting and are elgible for slight tweaking to fit most individuals.
For American made styles, the pattern most often called the "Early Lancaster" will fit a large majority of people to a reasonable degree.
Here is a basic consideration for pitch without going into an epistle of all the causes and effects........
* Pitch is designated as positive or negative from ZERO pitch which would be a ninety degree angle relation between the face of the butt and the barrel. An 89 degree angle is +1 of pitch. Pitch is measured in degrees so a straight edge and a protractor is best used as opposed to a wall and floor.
* Pitch consideration can reduce felt recoil and adjust elevation of the shot on guns shooting shot. Correct pitch also allows a consistent mount to allow the eye to get positioned behind the sights on a rifle every time.
* Make the pitch of the gun so that the shooter has good contact with the butt in all areas in their chosen shooting stance. Men with large pectoral areas and women need more positive pitch than a skinny person.
* Radical crescent butts are a different animal and LOP will be a larger factor with them. I have not placed much study on them and their effects as they are not of my interest. IMHO they are not really designed from the get-go for recoil management due to their curve, width and their intended mounting location.