NeilL has it. If you mix results from different testing grounds you will lose clarity and definition. Earlier on I gave examples of how SWEFTA courses can be harder than GP courses, the evidence shows that to be the case, with only one shooter doing better at home.
If on the other hand you have quite simply easy courses especially for bringing on youngsters and new shooters, which is right and proper, how do you reconcile scores from a course with 18 yard freestyle 40mm kills with GP scores?
Is there really any problem with a shooter having two grades? I shoot LSR in A grade and bench rest in B grade; they are different disciplines, let's just see GPs as being the ultimate test and a harder standard to achieve than regional FT.