Bill,
I've modified the pitch on a number of my guns with no damage to the original butt. Using the RTV as an adhesive and adding anywhere from 1/16-1/8" of leather rubber to either the heel or toe will keep the gun on your shoulder. It does'nt take much to correct the pitch for shootable dimensions. Anyone who would cut a SSBP should have his head examined and be banned from owning any nice gun.