I and Rocketman, I thought, were understanding that the butt was the rotation point. What if a body type makes your yardstick 38 inches or 34 inches? Does everyone grip a forearm the same? Does a straight extended heavy off arm and forward leaning stance change the effective weight and distribution, a pivot point around the waist change things? Now the shooter hands the same gun dynamics to his petite wife and she leans back to counter the relatively heavy weight for her round of shooting? Do you see the the same numbers on paper?