I have experimented with pitch for my shotguns for several decades and agree with above comments that it can affect consistency of mounting, comfort under recoil as well as POI. Just so we are all talking the same language I measure pitch in degrees, not inches. It is the angle in degrees off a line through the butt plate that is perpendicular to the sighting plane/top of the vent rib. I have found that many factory guns are about 5 degrees down pitch and I have learned through much experimentation that for my shape and size ( 6' 3" and 210 lb ) that 8 degrees down pitch is more consistent for a good gun mount and POI for me. Furthermore, a long LOP trap gun always shot at relatively low angles above horizontal can benefit from a less down pitch (resulting in a slightly higher POI under recoil) than a skeet or sporting gun that may be shot from horizontal angles to much higher angles/almost straight up. Same goes for a game gun used the same way, providing more like a 50/50 POI on clays and birds. Also, many women find a shotgun with a bit more down pitch to be more comfortable because the toe of the buttplate or recoil pad does not dig in as much in the upper chest area. My conclusion from all of this is that Pitch is every bit as important as Length of Pull and Drop at Comb if you want your shotgun to really fit for the type of shooting you do with it.