I like pitch measured by angulation to line extended from rib or barrels. Strait edge and layout protractor or large home made T-bevel of lath or yardstick and protractor tell all. Glenn Baker (Woodcock Hill) claims that "most people" are accomodated by 5 to 7 degrees acute included angle (I never can remember which one is negative/positive, down/up), no matter tw's pectoral "buildout". How much or how little rib I see with a quick mount appears to correlate with elevation changes in POI for all purposes and DAF tells that story. Roland "the gunfitter" troubled me for years with his vagaries about pitch; I've stopped being troubled but conclude that pitch probably has some slight effect on recoil vector.

jack