I have a SKB 85 TSS Unsingle that I shoot fairly WELL. I just bought a SKB (YES,I'm a SKB fan) GC7 Topsingle. both have a MC Adj. stock (my new GC7 is left-handed ,as I am). IF, I go to the pattern board with the idea of "getting" my new gun to shoot where my old one does,where should I shoot from ??? 13yds with a trap full?? That's my thinking, then I can match the two?