All these opinions sent me to the books. I quote from Yardley"s book, "Gunfitting: The Quest for Perfection", page 42..."However, measuring pitch by distance of the muzzles from the perpendicular has disadvantages. It is significantly altered by barrel length. The measurement of pitch may be carried out much more accurately in a purpose-built jig which measures pitch in degrees rather than in inches or other units of distance." and "Pitch is usually downwards. With a gun set up for game shooting or sporting clays, an average pitch down measurement for a side-by-side would be about 4 degrees or 2 inches(measured in the latter case from the perpencicular surface to the top surface of the barrel or rib) and a little more, 5-6 degrees or 2.5 to 3 inches for an over-and-under; less pitch than this may, practically speaking, make the gun shoot high because pitch affects the way the gun is mounted." He then goes on to site the amount of pitch various gun notables used. Best, Dr. BILL
