In copying the c. 33,600 individual sheets of paper that made up the surviving Parker Gun records at Ilion in 1999, I doubt we ever saw more than 1/2 dozen Order Book notations that gave all of the classic 3-way measurements for a 'true' custom stock-dimensioned LOP; e.g., heel, midpoint, and toe lengths from the trigger.
Drew's Purdey chart via David Trevallion shows how it's done 'to the max', so to speak. Subtle differences recorded in precise lengths and angles to the shoulder and breast muscles are recorded and duplicated in the best fitting stocks, especially in women, including cast on or off, down- or up- pitch, and, in the case of the middle measurement, "yaw" taken into account in how the person mounts, shoulders, and cheeks the gun at the "moment of truth."
For an easy, visible example of how production guns are compensated for the above variables, just look at a diehard trapshooter or sporting clays fanatic's stock fitted with one of the modern "twist and shout" adjustable pads. ('Twist' as in "I'll smoke his butt" next time and 'Shout' as in "Damn! I missed it again!!")
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